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• Xen networking is inconsistent in multiple ways

  - by WildVelociraptor

  I've been running xen for a few weeks now on an Ubuntu 12.04 server. I've got 3 guests: a Windows Server 2003 guest, an Ubuntu guest, and a Windows 7 Guest. My Server 2003 guest seems to work fine; I can ping it from the network, the hostname resolves correctly, and it can see the internet. This guest is attached to xenbr0, and its IP is 10.100.1.21. My Win7 guest is what is driving me crazy. I use the same configuration script as a base, changing the important parts (hostname and boot disk, mainly). It installed correctly, and is currently running, but I am unable to ping this guest. It's hostname is "alexander", with an IP of 10.100.1.22. It is also using xenbr0. The guest can ping the firewall and various IP addressess, but seems unable to resolve hostnames. Now heres the weird part: when I use rdesktop (RDP client) from my laptop (not the xen host) to connect to alexander, it works just fine. It apparently resolves the hostname fine, and does the same with the IP address. So, can someone tell me why I can access this guest using RDP, but not using ping, nslookup, traceroute, etc? It's apparently invisible to all but RDP. Also, is it okay to use two guests on the same bridge, or do i need different ones for each guest? Thanks in advance for any help. Regards

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• Ubuntu Server: Networking fails with MODPROBE option in /etc/network/interfaces ... ??

  - by neezer

  For some reason (which I haven't been able to determine yet), yesterday morning the networking service on our web server (running Ubuntu 8.04.2 LTS -- hardy) wouldn't start, and our website went down. I noticed the following error message when trying to restart it: * Reconfiguring network interfaces... /etc/network/interfaces:6: option with empty value ifup: couldn't read interfaces file "/etc/network/interfaces" ...fail! Line 6 in the /etc/network/interfaces file concerned a MODPROBE command, which (I believe) loaded in the ip_conntrack_ftp module so that I could use PASV on my FTP server (vsftpd): (breaking modprobe commands commented out below) # Used by ifup(8) and ifdown(8). See the interfaces(5) manpage or # /usr/share/doc/ifupdown/examples for more information. # The loopback network interface auto lo iface lo inet loopback #MODPROBE=/sbin/modprobe #$MODPROBE ip_conntrack_ftp pre-up iptables-restore < /etc/iptables.up.rules # The primary network interface # Uncomment this and configure after the system has booted for the first time auto eth0 iface eth0 inet static address xxx.xxx.xxx.xxx netmask 255.255.255.0 gateway xxx.xxx.xxx.1 dns-nameservers xxx.xxx.xxx.4 xxx.xxx.xxx.5 I've verified that there is a file in /sbin called modprobe. Like I said earlier, this setup had been working flawlessly until yesterday morning (though my bosses say that the site actually went down the previous night at 11 PM EST). Can anyone shed some light on (A) why this broke, and (B) how can I re-enable the ip_conntrack_ftp module?

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• Monit - script not being executed as expected

  - by Thaís

  I'm working on a Windows 7 machine, having a VM for Ubuntu (image disk: 12.04-desktop-i386.iso). On the VM I installed Monit 5.3.2, and configured some processes and applications. So I created a script to run my application. This application should display some content on the screen (Im basically displaying two images, using Feh). The thing is: if I call my script through the command line, it runs ok, and display the images. But if I run through monit, it seems to be running ok, but it doesn't display the images.In the case I try to debug it (remote debug), then I can see the images. So I was supposing this could be some kind of configuration, but didn't find out what (even using the option -I wou'ldn't work). I"m showing below more details: -Piece of script on Monit---- check program runMediaHandler with path "/usr/bin/runMediaHandler.sh" if status == 1 then alert -runMediaHandler.sh ---- #!/bin/bash java -jar /home/thais/Desktop/MediaHandler_RC2.jar Summarizing: 1.What works: if I run java directly: java -jar /home/thais/Desktop/MediaHandler_RC2.jar if I run the script directly: runMediaHandler.sh if I remote debug putting a breakpoint where the image should be displayed 2.What does not work: putting that piece of information on Monit to "check program", writen above (even if calling monit -I start runMediaHandler) Thank you in advance, Thaís

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• Joining an Ubuntu 14.04 machine to active directory with realm and sssd

  - by tubaguy50035

  I've tried following this guide to set up realmd and sssd with active directory: http://funwithlinux.net/2014/04/join-ubuntu-14-04-to-active-directory-domain-using-realmd/ When I run the command realm –verbose join domain.company.com –user-principal=c-u14-dev1/[email protected] –unattended everything seems to connect. My sssd.conf looks like the following: [nss] filter_groups = root filter_users = root reconnection_retries = 3 [pam] reconnection_retries = 3 [sssd] domains = DOMAIN.COMPANY.COM config_file_version = 2 services = nss, pam [domain/DOMAIN.COMPANY.COM] ad_domain = DOMAIN.COMPANY.COM krb5_realm = DOMAIN.COMPANY.COM realmd_tags = manages-system joined-with-adcli cache_credentials = True id_provider = ad krb5_store_password_if_offline = True default_shell = /bin/bash ldap_id_mapping = True use_fully_qualified_names = True fallback_homedir = /home/%d/%u access_provider = ad My /etc/pam.d/common-auth looks like this: auth [success=3 default=ignore] pam_krb5.so minimum_uid=1000 auth [success=2 default=ignore] pam_unix.so nullok_secure try_first_pass auth [success=1 default=ignore] pam_sss.so use_first_pass # here's the fallback if no module succeeds auth requisite pam_deny.so # prime the stack with a positive return value if there isn't one already; # this avoids us returning an error just because nothing sets a success code # since the modules above will each just jump around auth required pam_permit.so # and here are more per-package modules (the "Additional" block) auth optional pam_cap.so However, when I try to SSH into the machine with my active directory user, I see the following in auth.log: Aug 21 10:35:59 c-u14-dev1 sshd[11285]: Invalid user nwalke from myip Aug 21 10:35:59 c-u14-dev1 sshd[11285]: input_userauth_request: invalid user nwalke [preauth] Aug 21 10:36:10 c-u14-dev1 sshd[11285]: pam_krb5(sshd:auth): authentication failure; logname=nwalke uid=0 euid=0 tty=ssh ruser= rhost=myiphostname Aug 21 10:36:10 c-u14-dev1 sshd[11285]: pam_unix(sshd:auth): check pass; user unknown Aug 21 10:36:10 c-u14-dev1 sshd[11285]: pam_unix(sshd:auth): authentication failure; logname= uid=0 euid=0 tty=ssh ruser= rhost=myiphostname Aug 21 10:36:10 c-u14-dev1 sshd[11285]: pam_sss(sshd:auth): authentication failure; logname= uid=0 euid=0 tty=ssh ruser= rhost=myiphostname user=nwalke Aug 21 10:36:10 c-u14-dev1 sshd[11285]: pam_sss(sshd:auth): received for user nwalke: 10 (User not known to the underlying authentication module) Aug 21 10:36:12 c-u14-dev1 sshd[11285]: Failed password for invalid user nwalke from myip port 34455 ssh2 What do I need to do to allow active directory users the ability to log in?

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• How to remove all Couchdb versions in Ubuntu 10.04 (server)? ( after multiple installs )

  - by DjangoRocks

  Hi all, I have done multiple installs of CouchDB using sudo aptitude install couchdb sudo ap-get install couchdb and more recently based on the instructions found at L http://wiki.apache.org/couchdb/Installing_on_Ubuntu May I know how do I uninstall or remove all the above installations? Best Regards. +++++++++++++++++++UPDATE++++++++++++++++++++++++ I've tried running the following commands: apt-get remove couchdb apt-get purge couchdb but received the following errors: (Reading database ... 39814 files and directories currently installed.) Removing couchdb ... invoke-rc.d: initscript couchdb, action "stop" failed. dpkg: error processing couchdb (--remove): subprocess installed pre-removal script returned error exit status 1 invoke-rc.d: initscript couchdb, action "start" failed. dpkg: error while cleaning up: subprocess installed post-installation script returned error exit status 1 Errors were encountered while processing: couchdb E: Sub-process /usr/bin/dpkg returned an error code (1) May I know how do i fix this? ON issuing the command : dpkg -l | grep couchdb I received the following response: rF couchdb 0.10.0-1ubuntu2 RESTful document oriented database, system D iF couchdb-bin 0.10.0-1ubuntu2 RESTful document oriented database, programs How do i uninstall CouchDB ? I think there's some file corruption?

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• Linux Experts Riddle: Network output of 10MB/s on 10GB/s NIC

  - by user150324

  I have two CentOS 6 servers. I am trying to transfer files between them. Source server has 10GB/s NIC nd destination server has 1GB/s NIC. Regardless to the command used nor the protocol, the transfer speed is ~1 Mega byte per second. The goal is at least couple dozens MB per second. I have tried: rsync (also with various encryptions), scp, wget, aftp, nc. Here's some testing results with iperf: [root@serv ~]# iperf -c XXX.XXX.XXX.XXX -i 1 ------------------------------------------------------------ Client connecting to XXX.XXX.XXX.XXX, TCP port 5001 TCP window size: 64.0 KByte (default) ------------------------------------------------------------ [ 3] local XXX.XXX.XXX.XXX port 33180 connected with XXX.XXX.XXX.XXX port 5001 [ ID] Interval Transfer Bandwidth [ 3] 0.0- 1.0 sec 1.30 MBytes 10.9 Mbits/sec [ ID] Interval Transfer Bandwidth [ 3] 1.0- 2.0 sec 1.28 MBytes 10.7 Mbits/sec [ ID] Interval Transfer Bandwidth [ 3] 2.0- 3.0 sec 1.34 MBytes 11.3 Mbits/sec [ ID] Interval Transfer Bandwidth [ 3] 3.0- 4.0 sec 1.53 MBytes 12.8 Mbits/sec [ ID] Interval Transfer Bandwidth [ 3] 4.0- 5.0 sec 1.65 MBytes 13.8 Mbits/sec [ ID] Interval Transfer Bandwidth [ 3] 5.0- 6.0 sec 1.79 MBytes 15.0 Mbits/sec [ ID] Interval Transfer Bandwidth [ 3] 6.0- 7.0 sec 1.95 MBytes 16.3 Mbits/sec [ ID] Interval Transfer Bandwidth [ 3] 7.0- 8.0 sec 1.98 MBytes 16.6 Mbits/sec [ ID] Interval Transfer Bandwidth [ 3] 8.0- 9.0 sec 1.91 MBytes 16.0 Mbits/sec [ ID] Interval Transfer Bandwidth [ 3] 9.0-10.0 sec 2.05 MBytes 17.2 Mbits/sec [ ID] Interval Transfer Bandwidth [ 3] 0.0-10.0 sec 1.68 MBytes 14.0 Mbits/sec I guess HD is not the bottleneck here.

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• Connection established to google DNS, can't resolve any hosts

  - by Tar

  As you can see from the picture above, I am connected to google DNS but am unable to resolve any hostnames. When I try to ping sites like google.com, yahoo.com, etc, I get 'ping: unknown host'. Yes, I am able to ping localhost, I am able to ping hostname.domain.com, but not domain.com. I can't ping my nameservers. I can ping all hosts by IP address and that works. The output of my /etc/resolv.conf: nameserver 8.8.8.8 nameserver 8.8.4.4 Anyone know what the problem could be? 23:30:04.304955 IP my_server.44457 > 8.8.8.8.domain: 28349+ A? google.com. (28) 23:30:06.137985 IP 112.100.0.78.19781 > my_server.domain: 18717 [1au] A? www.my_domain.com. (46) 23:30:06.138286 IP my_server.domain > 112.100.0.78.19781: 18717*- 2/0/1 CNAME my_domain.com., A my_server (76) 23:30:06.686582 IP 112.100.0.74.19181 > my_server.domain: 65046 [1au] A? my_domain.com. (42) 23:30:06.686811 IP my_server.domain > 112.100.0.74.19181: 65046*- 1/0/1 A my_server (58) 23:30:07.043764 IP my_server.50465 > 4.2.2.1.domain: 13865+ PTR? 142.254.22.67.in-addr.arpa. (44) 23:30:09.065904 IP my_server.45242 > 8.8.4.4.domain: 29011+ PTR? 123.72.117.130.in-addr.arpa. (45) 23:30:09.310021 IP my_server.45440 > 8.8.4.4.domain: 28349+ A? google.com. (28)

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• Convert mp4 video to a format xbox 360 can play

  - by Björn Lindqvist

  Here is a video file my Xbox 360 refuses to play: $ MP4Box -info video.mp4 * Movie Info * Timescale 90000 - Duration 02:18:33.365 Fragmented File no - 2 track(s) File Brand mp42 - version 0 Created: GMT Sat Jul 21 07:08:55 2012 File has root IOD (9 bytes) Scene PL 0xff - Graphics PL 0xff - OD PL 0xff Visual PL: ISO Reserved Profile (0x7f) Audio PL: High Quality Audio Profile @ Level 2 (0x0f) No streams included in root OD iTunes Info: Encoder Software: HandBrake 0.9.6 2012022800 Track # 1 Info - TrackID 1 - TimeScale 90000 - Duration 02:18:33.235 Media Info: Language "Undetermined" - Type "vide:avc1" - 199318 samples Visual Track layout: x=0 y=0 width=1280 height=688 MPEG-4 Config: Visual Stream - ObjectTypeIndication 0x21 AVC/H264 Video - Visual Size 1280 x 688 AVC Info: 1 SPS - 1 PPS - Profile High @ Level 4.1 NAL Unit length bits: 32 Self-synchronized Track # 2 Info - TrackID 2 - TimeScale 48000 - Duration 02:18:33.365 Media Info: Language "English" - Type "soun:mp4a" - 389689 samples MPEG-4 Config: Audio Stream - ObjectTypeIndication 0x40 MPEG-4 Audio MPEG-4 Audio AAC LC - 6 Channel(s) - SampleRate 48000 Synchronized on stream 1 $ avconv -i video.mp4 avconv version 0.8.4-4:0.8.4-0ubuntu0.12.04.1, Copyright (c) 2000-2012 the Libav developers built on Nov 6 2012 16:51:33 with gcc 4.6.3 Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'video.mp4': Metadata: major_brand : mp42 minor_version : 0 compatible_brands: mp42isomavc1 creation_time : 2012-07-21 07:08:55 encoder : HandBrake 0.9.6 2012022800 Duration: 02:18:33.36, start: 0.000000, bitrate: 2299 kb/s Stream #0.0(und): Video: h264 (High), yuv420p, 1280x688, 1973 kb/s, 23.98 fps, 90k tbr, 90k tbn, 180k tbc Metadata: creation_time : 2012-07-21 07:08:55 Stream #0.1(eng): Audio: aac, 48000 Hz, 5.1, s16, 319 kb/s Metadata: creation_time : 2012-07-21 07:08:55 At least one output file must be specified What tool, such as ffmpeg or mencoder, and what magic command line incantation should I use to transcode this file into a format Xbox 360 can play? I want the transcode process to retain as good video quality as possible.

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• Debian Linux bridging router intermittently dropping packets [migrated]

  - by nomen

  My old Asus router died a few weeks ago, so I thought I'd set up my Debian box to deal with routing my home network. I have a few complications, but I adapted my configuration from a previously working configuration, and I don't see why I am having intermittent problems. But I am having them! Every so often, my SSH connections to the router (and to the Xen virtual machines hosted by the router) just drop. I am unable to use the router's dns server. I can't ping the router. Etc. (I can provide more details, but I'm not sure what will be helpful) /etc/network/interfaces: # The loopback network interface auto lo iface lo inet loopback # Gigabit ethernet, internal network auto eth0 allow-hotplug eth0 iface eth0 inet manual # USB ethernet, internet auto eth1 allow-hotplug eth1 iface eth1 inet dhcp # Xen Bridge auto xlan0 iface xlan0 inet static bridge_ports eth0 address 10.47.94.1 netmask 255.255.255.0 As I understand it, this is sufficient to create the network interfaces, and even do some switching between Xen hosts and my eth0 interface. I installed and configured Shorewall to manage routing: /etc/shorewall/zones fw firewall net ipv4 lan ipv4 /etc/shorewall/interfaces net eth1 detect dhcp,tcpflags,nosmurfs,routefilter,logmartians lan xlan0 detect dhcp,tcpflags,nosmurfs,routefilter,logmartians,routeback,bridge /etc/shorewall/policy net all DROP info fw net ACCEPT info all all REJECT info /etc/shorewall/rules DNS(ACCEPT) fw net DNS(ACCEPT) lan fw ... and so on, these all work, when the router is accepting traffic at all. /etc/shorewall/masq eth1 10.47.94.0/24 Can anybody help?

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• Any way to bring my laptop battery back to life?

  - by Josh

  Recently my laptop battery will get extremely hot (definitely hotter than it should get) when I charge it. After that I usually end up removing it once it's fully charged to let it cool down, which takes a couple hours... Question is, is my battery dead? My last battery I had that died just ended up lasting 2 - 3 minutes on battery, no weird heat issues. And is there any way to possibly fix this? Probably not but I won't be able to get a replacement anytime soon. UPDATE: A few days ago when this happened and it cooled down, assuming it was fully charged, I ran my laptop on battery, and the battery life lasted about 10 minutes and then the laptop shutdown. I then plugged it in later and charged it back up, and for a while I had a orange light blinking on my laptop - which I assumed meant the battery was dead, especially since I got 10 minutes battery life. Then today, I turned my laptop on and was surprised to see that the battery was at 20% and charging (it's been plugged in since the incident above, so it should have been fully charged when I shut it off) I let it charge up, and as usual it got pretty hot around the time it was fully charged. So I turned my laptop off and pulled the battery out to let it cool down Now the thing is, just now I tried running it on battery, and it's been going for an hour now... so maybe its not dead? (also the orange light is no longer blinking...) Thanks in advance if anyone knows whats going on, and how to fix it, if its fixable =] EDIT: Some info if it helps... my laptop is about 2 years ago, and it's an Asus K50ID. I know laptop batteries usually don't last more than a year but I'm trying to keep this one going for as long as I can.

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• How can I use two Internet connections in Ubuntu?

  - by Martin

  My goal is to be able to do something like this: curl google.com --interface ppp0 curl google.com --interface p2p2 ppp0 is a DSL connection, and p2p2 is a separate direct Internet connection. Currently I can only get one of these to work at a time. When I enable one, the other one stops working. /etc/network/interfaces: # The loopback network interface auto lo iface lo inet loopback # DSL auto p2p1 iface p2p1 inet manual auto dsl-provider iface dsl-provider inet ppp pre-up /sbin/ifconfig p2p1 up # line maintained by pppoeconf provider dsl-provider # DIRECT auto p2p2 iface p2p2 inet dhcp ifconfig: lo Link encap:Local Loopback inet addr:127.0.0.1 Mask:255.0.0.0 inet6 addr: ::1/128 Scope:Host UP LOOPBACK RUNNING MTU:65536 Metric:1 p2p1 Link encap:Ethernet inet6 addr: fe80::20a:ebff:fe21:99c6/64 Scope:Link UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1 p2p2 Link encap:Ethernet inet addr:192.168.1.101 Bcast:192.168.1.255 Mask:255.255.255.0 inet6 addr: fe80::20a:ebff:fe17:1249/64 Scope:Link UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1 ppp0 Link encap:Point-to-Point Protocol inet addr:53.193.231.167 P-t-P:53.193.224.1 Mask:255.255.255.255 UP POINTOPOINT RUNNING NOARP MULTICAST MTU:1492 Metric:1 route -n Kernel IP routing table Destination Gateway Genmask Flags Metric Ref Use Iface 0.0.0.0 0.0.0.0 0.0.0.0 U 0 0 0 ppp0 10.0.10.0 0.0.0.0 255.255.255.0 U 0 0 0 eth2 53.193.224.1 0.0.0.0 255.255.255.255 UH 0 0 0 ppp0 192.168.1.0 0.0.0.0 255.255.255.0 U 0 0 0 p2p2 By default, only ppp0 works. If I run "route add default gw 192.168.1.1 p2p2" then I can use p2p2 but ppp0 stops working. If I then run "route add default gw 53.193.224.1 ppp0" then I can use ppp0 again but p2p2 stops working. What can I do to be able to use both interfaces selectively?

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• check_snmp with snmpv3 protocol giving "Unkown Report message" error

  - by John

  I'm trying to add a nagios command to use snmpv3 for monitoring printer status messages. When using the check_snmp command, I get the following error: External command error: snmpget: Unknown Report message Here is the command I'm typing in: ./check_snmp -P 3 -H <hostname> -L authPriv -U snmpuser -A snmppassword -X snmppassword -o 1.3.6.1.4.1.11.2.4.3.1.2.0 -C public -d "STRING:" -a MD5 These values for auth key, private key, username, etc all work when using snmpwalk. Can someone enlighten me as to what that error message really means? EDIT: It looks like check_snmp isn't taking my v3 credentials when passing over to snmpget. Here is my input with the verbose option: ./check_snmp -H <hostname> -o 1.3.6.1.2.1.2.2.1.10.1 -C public -m ALL -P 3 -L authPriv -U snmpuser -a MD5 -A snmppassword -x DES -X snmppassword -v And here is the output: /usr/bin/snmpget -t 1 -r 5 -m ALL -v 3 [authpriv] <hostname>:161 1.3.6.1.2.1.2.2.1.10.1 External command error: snmpget: Unknown Report message So I guess now my question would be: why isn't check_snmp passing all the commandline options to snmpget?

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• Query Execution Failed in Reporting Services reports

  - by Chris Herring

  I have some reporting services reports that talk to Analysis Services and at times they fail with the following error: An error occurred during client rendering. An error has occurred during report processing. Query execution failed for dataset 'AccountManagerAccountManager'. The connection cannot be used while an XmlReader object is open. This occurs sometimes when I change selections in the filter. It also occurs when the machine has been under heavy load and then will consistently error until SSAS is restarted. The log file contains the following error: processing!ReportServer_0-18!738!04/06/2010-11:01:14:: e ERROR: Throwing Microsoft.ReportingServices.ReportProcessing.ReportProcessingException: Query execution failed for dataset 'AccountManagerAccountManager'., ; Info: Microsoft.ReportingServices.ReportProcessing.ReportProcessingException: Query execution failed for dataset 'AccountManagerAccountManager'. ---> System.InvalidOperationException: The connection cannot be used while an XmlReader object is open. at Microsoft.AnalysisServices.AdomdClient.XmlaClient.CheckConnection() at Microsoft.AnalysisServices.AdomdClient.XmlaClient.ExecuteStatement(String statement, IDictionary connectionProperties, IDictionary commandProperties, IDataParameterCollection parameters, Boolean isMdx) at Microsoft.AnalysisServices.AdomdClient.AdomdConnection.XmlaClientProvider.Microsoft.AnalysisServices.AdomdClient.IExecuteProvider.ExecuteTabular(CommandBehavior behavior, ICommandContentProvider contentProvider, AdomdPropertyCollection commandProperties, IDataParameterCollection parameters) at Microsoft.AnalysisServices.AdomdClient.AdomdCommand.ExecuteReader(CommandBehavior behavior) at Microsoft.AnalysisServices.AdomdClient.AdomdCommand.System.Data.IDbCommand.ExecuteReader(CommandBehavior behavior) at Microsoft.ReportingServices.DataExtensions.AdoMdCommand.ExecuteReader(CommandBehavior behavior) at Microsoft.ReportingServices.OnDemandProcessing.RuntimeDataSet.RunDataSetQuery() Can anyone shed light on this issue?

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• Giving VPN connections access to all locations?

  - by Jeff

  I have asked a similiar question, but didn't get any answers so i am going to try and rephrase. i have 4 locations corporate and 3 remotes when you are at the corporate location, you have full access to all networks. 192.168.3.x 192.168.2.x 192.168.1.x 192.168.0.x all locations are connected via site-to-site vpn with the corporate location. if you are at a remote location, you have access to that location & the corporate location. the corporate location handles all VPN traffic. however, when you VPN into the corporate location, you can not see outside the corporate location. can anyone provide some information or a link explaining how to allow the VPN users to see all locations? thanks static route configuration: Gateway of last resort is 207.255.x.1 to network 0.0.0.0 C 207.255.x.0 255.255.255.0 is directly connected, outside S 10.0.1.6 255.255.255.255 [1/0] via 207.255.x.1, outside S 10.0.1.5 255.255.255.255 [1/0] via 207.255.x.1, outside S 192.168.0.0 255.255.255.0 [1/0] via 192.168.0.1, inside C 192.168.1.0 255.255.255.0 is directly connected, inside S 192.168.2.0 255.255.255.0 [1/0] via 192.168.2.1, inside S 192.168.3.0 255.255.255.0 [1/0] via 192.168.3.1, inside S* 0.0.0.0 0.0.0.0 [1/0] via 207.255.x.1, outside [1/0] via 192.168.1.1, outside

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• Automatically Kill/Restart Process(es) When Memory is Critically Low

  - by nemesisfixx

  I have a Debian Wheezy VPS box where am running a couple of Django apps in production. Ideally, would have tried addressed my current memory footprint issues by optimizing the apps, adding more RAM or augmenting with Swap. But the problem is that I doubt there's much memory optimization I'd milk from optimizing the Django apps (the stack being open-source and robust), and adding RAM is a cost constraint for me (this is a remote VPS), also, the host doesn't offer options to use Swap! So, in the meantime (as I wait to secure more resources to afford more RAM), I wish to mitigate the scenarios where the server runs out memory so that I just have to request a VPS restart (as in, at that point, I can't even SSH into the box!). So, what I would love in a solution is the ability to detect when a process (or generally, total system memory usage) exceeds a certain critical amount (for now, example the FREE RAM falls to say 10%) - which I've noticed occurs after the VPS's been up for long, and when also traffic is suddenly much to some of the heavy apps (most are just staging apps anyway). So, I wish to be able to kill/restart the offending process(es) - most likely Apache. Which solution when done manually in these situations has restored sane memory usage levels - a hint that possibly one or more of the Django apps has a memory leak? In brief: Monitor overall system RAM usage When FREE RAM falls below a given critical threshold (say below 10%), kill/restart the offending process(es) - or simpler, if we assume from my current log analysis (using linux-dash) that Apache is often the offender, then kill/restart it. Rinse and repeat...

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• Http-Only cookies in WebLogic: what versions support them/how and why are they supported?

  - by John

  We want to make all cookies set by our webapp http-only. I only have a basic understanding of the benefits of doing this but I'm told by security people that it's a Good Thing (tm) Our app is running under JDK1.6.05 and WebLogic10.3.0 After way too much digging around Oracle's website for documentation, I've found good evidence that the first version of WebLogic to support http-only cookies is 10.3.1. By "support," I mean the cookie-http-only deployment-descriptor element. Before we go about upgrading, I'd be nice to have these questions answered: 1a) Is it accurate that WL10.3.1 is the first version to support http-only cookies and that we're out of luck with 10.3.0? 1b) If we do indeed need to upgrade, is there an easy to do so under Windows? I've heard people mention an "upgrade jar" that you just stick in the classpath but I can't find any mention of this by Oracle. Does an easy way exist, or do we need to do a full-install of the new version? 2) What does the cookie-http-only deployment-descriptor element do when enabled? Will it ensure all cookies set by the application have an http-only=true attribute? Will it do more or less? Is there anything I'll have to do programmatically? 3) Is there anything in general I should know about http-only cookies, getting my web app to take advantage of them, or other security concerns?

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• Fetch videos from sony handycam to linux

  - by bstpierre

  I've got a Sony Handycam DCR-DVD101. When I plug connect the USB cable to my laptop (Ubuntu 10) it doesn't mount any storage device. If I run usb-devices, I see: T: Bus=02 Lev=02 Prnt=02 Port=00 Cnt=01 Dev#= 6 Spd=480 MxCh= 0 D: Ver= 2.00 Cls=00(>ifc ) Sub=00 Prot=00 MxPS=64 #Cfgs= 1 P: Vendor=054c ProdID=00c1 Rev=01.00 S: Manufacturer=SONY S: Product=Storage Device C: #Ifs= 1 Cfg#= 1 Atr=c0 MxPwr=2mA I: If#= 0 Alt= 0 #EPs= 2 Cls=08(stor.) Sub=05 Prot=50 Driver=usb-storage The driver says usb-storage, but I'm not sure how to get the device mounted. Is there a way to make this work? Update: checking dmesg, I see: [259072.576559] usb 2-1.1: new high speed USB device using ehci_hcd and address 6 [259072.687200] usb 2-1.1: configuration #1 chosen from 1 choice [259072.836188] Initializing USB Mass Storage driver... [259072.836476] scsi5 : SCSI emulation for USB Mass Storage devices [259072.836632] usb-storage: device found at 6 [259072.836636] usb-storage: waiting for device to settle before scanning [259072.836660] usbcore: registered new interface driver usb-storage [259072.836666] USB Mass Storage support registered. [259077.830410] usb-storage: device scan complete [259077.832343] scsi 5:0:0:0: CD-ROM SONY DDX-A1010 R1.0 PQ: 0 ANSI: 0 [259077.888167] sr1: scsi3-mmc drive: 0x/0x pop-up [259077.888446] sr 5:0:0:0: Attached scsi CD-ROM sr1 [259077.888593] sr 5:0:0:0: Attached scsi generic sg2 type 5 [259080.002079] sr 5:0:0:0: [sr1] Unhandled sense code [259080.002085] sr 5:0:0:0: [sr1] Result: hostbyte=DID_OK driverbyte=DRIVER_SENSE [259080.002091] sr 5:0:0:0: [sr1] Sense Key : Blank Check [current] [259080.002097] sr 5:0:0:0: [sr1] Add. Sense: No additional sense information [259080.002104] sr 5:0:0:0: [sr1] CDB: Read(10): 28 00 00 00 00 00 00 00 02 00 00 00 [259080.002117] end_request: I/O error, dev sr1, sector 0 [259080.002123] Buffer I/O error on device sr1, logical block 0 [259080.002128] Buffer I/O error on device sr1, logical block 1 Those I/O errors don't look good, is there any hope?

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• How to let MSN or Yahoo Messenger set you to be Invisible or Offline when you are idle for an hour?

  - by Jian Lin

  The short question is: How do we let MSN or Yahoo Messenger set us to be Invisible or Offline when we are idle for half an hour or an hour? The reason is: if I am on 24 hours a day, some people see me as weird. Some people see my value as low, because I am always there. There are ways to set me to "Away" or "Busy" after 10 minutes, but there seems to be no way to set myself to invisible or offline after 1 hour. As I am a software developer, I am very used to turning the computer on 24 hours a day. (for example, for checking email for urgent fixes, and fix issue and push to web server). We don't turn off computer usually even when we sleep, because we may sometimes can't sleep yet and come check on the computer, or wake up in the morning and immediately need to check if everything is ok. But, my MSN and Yahoo Messenger is always on for 24 hours a day, and I found that some girls start to ask me why I am always there 24 hours a day (even though they see me as away or busy, their feeling is that I am always there). What's more, I found that since I am always there, my value actually drop in their eyes, because hard to get = high value, and always there = low value. Some people feel me as having nothing much to do, always in front of computer, or what is he doing in front of computer so much? Now since it is my job, and I need to read emails once in a while, I am in fact in front of the computer more than some other people. I am in front of the computer maybe 10 hours a day, far from 24 hours a day. Is there an easy and automatic solution to this?

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• Apache Logs - Not Showing Requested URL or User IP

  - by iarfhlaith

  Hey all, I'm having a problem with a server that keeps falling over. Looking through the Apache error logs it appears to come from a rogue PHP script. I'm trying to track this down using Apache's error_log and access_log but the server log format isn't giving me the detail I need. I suspect the log format isn't sufficient, but I've reviewed the Apache documentation and I've included the switches that I think I need to see. Here's my LogFormat configuration in the httpd.conf file: `LogFormat "%h %l %u %t \"%r\" %s %b %U %q %T \"%{Referer}i\" \"%{User-Agent}i\"" extended CustomLog logs/access_log extended` Using the %U %q %T switches I expected to see the requested URL, query string, and the time it took to serve the request, but I'm not seeing any of this information when I tail the log. Here's an example: 127.0.0.1 - - [01/Jun/2010:14:12:04 +0100] "OPTIONS * HTTP/1.0" 200 - * 0 "-" "Apache/2.2.15 (Unix) mod_ssl/2.2.15 OpenSSL/0.9.8e-fips-rhel5 mod_bwlimited/1.4 (internal dummy connection)" 127.0.0.1 - - [01/Jun/2010:14:12:05 +0100] "OPTIONS * HTTP/1.0" 200 - * 0 "-" "Apache/2.2.15 (Unix) mod_ssl/2.2.15 OpenSSL/0.9.8e-fips-rhel5 mod_bwlimited/1.4 (internal dummy connection)" 127.0.0.1 - - [01/Jun/2010:14:12:06 +0100] "OPTIONS * HTTP/1.0" 200 - * 0 "-" "Apache/2.2.15 (Unix) mod_ssl/2.2.15 OpenSSL/0.9.8e-fips-rhel5 mod_bwlimited/1.4 (internal dummy connection)" 127.0.0.1 - - [01/Jun/2010:14:12:07 +0100] "OPTIONS * HTTP/1.0" 200 - * 0 "-" "Apache/2.2.15 (Unix) mod_ssl/2.2.15 OpenSSL/0.9.8e-fips-rhel5 mod_bwlimited/1.4 (internal dummy connection)" 127.0.0.1 - - [01/Jun/2010:14:12:08 +0100] "OPTIONS * HTTP/1.0" 200 - * 0 "-" "Apache/2.2.15 (Unix) mod_ssl/2.2.15 OpenSSL/0.9.8e-fips-rhel5 mod_bwlimited/1.4 (internal dummy connection)" 127.0.0.1 - - [01/Jun/2010:14:12:09 +0100] "OPTIONS * HTTP/1.0" 200 - * 0 "-" "Apache/2.2.15 (Unix) mod_ssl/2.2.15 OpenSSL/0.9.8e-fips-rhel5 mod_bwlimited/1.4 (internal dummy connection)" Have a made a mistake in configuring the LogFormat or is it something else? Also, each request appears to come from the localhost. How come it's not giving me the remote user's IP address? Thanks, Iarfhlaith

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• Allow access from outside network with dmz and iptables

  - by Ivan

  I'm having a problem with my home network. So my setup is like this: In my Router (using Ubuntu desktop v11.04), I installed squid proxy as my transparent proxy. So I would like to use dyndns to my home network so I could be access my server from the internet, and also I installed CCTV camera and I would like to enable watching it from internet. The problem is I cannot access it from outside the net. I already set DMZ in my modem to my router ip. My first guess is because i'm using iptables to redirect all inside network to use squid. And not allow from outside traffic to my inside network. Here is my iptables script: #!/bin/sh # squid server IP SQUID_SERVER="192.168.5.1" # Interface connected to Internet INTERNET="eth0" # Interface connected to LAN LAN_IN="eth1" # Squid port SQUID_PORT="3128" # Clean old firewall iptables -F iptables -X iptables -t nat -F iptables -t nat -X iptables -t mangle -F iptables -t mangle -X # Load IPTABLES modules for NAT and IP conntrack support modprobe ip_conntrack modprobe ip_conntrack_ftp # For win xp ftp client #modprobe ip_nat_ftp echo 1 > /proc/sys/net/ipv4/ip_forward # Setting default filter policy iptables -P INPUT DROP iptables -P OUTPUT ACCEPT # Unlimited access to loop back iptables -A INPUT -i lo -j ACCEPT iptables -A OUTPUT -o lo -j ACCEPT # Allow UDP, DNS and Passive FTP iptables -A INPUT -i $INTERNET -m state --state ESTABLISHED,RELATED -j ACCEPT # set this system as a router for Rest of LAN iptables --table nat --append POSTROUTING --out-interface $INTERNET -j MASQUERADE iptables --append FORWARD --in-interface $LAN_IN -j ACCEPT # unlimited access to LAN iptables -A INPUT -i $LAN_IN -j ACCEPT iptables -A OUTPUT -o $LAN_IN -j ACCEPT # DNAT port 80 request comming from LAN systems to squid 3128 ($SQUID_PORT) aka transparent proxy iptables -t nat -A PREROUTING -i $LAN_IN -p tcp --dport 80 -j DNAT --to $SQUID_SERVER:$SQUID_PORT # if it is same system iptables -t nat -A PREROUTING -i $INTERNET -p tcp --dport 80 -j REDIRECT --to-port $SQUID_PORT # DROP everything and Log it iptables -A INPUT -j LOG iptables -A INPUT -j DROP If you know where did I miss, please advice me. Thanks for all your help and I really appreciate it.

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• OS X won't see Windows 7 in network (and vice versa)

  - by meds

  I've enabled SMB sharing in OS X Lion and have added folders to share, it says 'Windows Sharing: On' with a green circle next to it (from the sharing window) and that to access the volume I will need to to go to \\192.168.0.17. It also says that the OS X should be visible as 'macbook' in the network. Both my WIndows 7 and OS X are connected to the same network, yet when I try to go to \\192.168.0.17 or from the Mac try to go to my Windows system (smb://192.168.0.6) the two OSs don't see each other. Any ideas why? Attempting to ping the Mac from Windows results in this output in the command prompt: Pinging 192.168.0.17 with 32 bytes of data: Reply from 192.168.0.6: Destination host unreachable. Request timed out. Request timed out. Request timed out. Ping statistics for 192.168.0.17: Packets: Sent = 4, Received = 1, Lost = 3 (75% loss), ipconfig in Windows is: Wireless LAN adapter Wireless Network Connection: Connection-specific DNS Suffix . : Link-local IPv6 Address . . . . . : fe80::8918:efd1:b05c:890f%21 IPv4 Address. . . . . . . . . . . : 192.168.0.6 Subnet Mask . . . . . . . . . . . : 255.255.255.0 Default Gateway . . . . . . . . . : 192.168.0.1 Ethernet adapter Bluetooth Network Connection: Media State . . . . . . . . . . . : Media disconnected Connection-specific DNS Suffix . : Ethernet adapter VMware Network Adapter VMnet1: Connection-specific DNS Suffix . : Link-local IPv6 Address . . . . . : fe80::98ab:63fc:3c07:d837%13 IPv4 Address. . . . . . . . . . . : 192.168.74.1 Subnet Mask . . . . . . . . . . . : 255.255.255.0 Default Gateway . . . . . . . . . : Ethernet adapter VMware Network Adapter VMnet8: Connection-specific DNS Suffix . : Link-local IPv6 Address . . . . . : fe80::80ff:c575:7b50:3a10%14 IPv4 Address. . . . . . . . . . . : 192.168.21.1 Subnet Mask . . . . . . . . . . . : 255.255.255.0 Default Gateway . . . . . . . . . : Tunnel adapter isatap.{2E97D0AE-9E18-4072-AC23-1979BA0DCB79}: Media State . . . . . . . . . . . : Media disconnected Connection-specific DNS Suffix . : Tunnel adapter isatap.{E260CE43-E9A7-4DE0-A88E-4EAFF68ACDDB}: Media State . . . . . . . . . . . : Media disconnected Connection-specific DNS Suffix . : Tunnel adapter isatap.{A5130812-59CE-4DDF-9C35-9433BCED9831}: Media State . . . . . . . . . . . : Media disconnected Connection-specific DNS Suffix . : Tunnel adapter Teredo Tunneling Pseudo-Interface: Media State . . . . . . . . . . . : Media disconnected Connection-specific DNS Suffix . : Tunnel adapter isatap.{134BCAE7-CFFF-4A98-8DA0-3708806AABEB}: Media State . . . . . . . . . . . : Media disconnected Connection-specific DNS Suffix . : Tunnel adapter isatap.{8D9E3B8F-161C-4ACE-B211-3EDD694416B2}: Media State . . . . . . . . . . . : Media disconnected Connection-specific DNS Suffix . : in OS X: lo0: flags=8049<UP,LOOPBACK,RUNNING,MULTICAST> mtu 16384 options=3<RXCSUM,TXCSUM> inet6 fe80::1%lo0 prefixlen 64 scopeid 0x1 inet 127.0.0.1 netmask 0xff000000 inet6 ::1 prefixlen 128 gif0: flags=8010<POINTOPOINT,MULTICAST> mtu 1280 stf0: flags=0<> mtu 1280 en0: flags=8863<UP,BROADCAST,SMART,RUNNING,SIMPLEX,MULTICAST> mtu 1500 options=2b<RXCSUM,TXCSUM,VLAN_HWTAGGING,TSO4> ether c8:2a:14:01:24:c1 media: autoselect (none) status: inactive en1: flags=8863<UP,BROADCAST,SMART,RUNNING,SIMPLEX,MULTICAST> mtu 1500 ether e0:f8:47:0c:fe:04 inet6 fe80::e2f8:47ff:fe0c:fe04%en1 prefixlen 64 scopeid 0x5 inet 192.168.0.17 netmask 0xffffff00 broadcast 192.168.0.255 media: autoselect status: active p2p0: flags=8843<UP,BROADCAST,RUNNING,SIMPLEX,MULTICAST> mtu 2304 ether 02:f8:47:0c:fe:04 media: autoselect status: inactive fw0: flags=8863<UP,BROADCAST,SMART,RUNNING,SIMPLEX,MULTICAST> mtu 4078 lladdr 70:cd:60:ff:fe:d8:f1:32 media: autoselect <full-duplex> status: inactive

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• How do you handle data archiving?

  - by 20th Century Boy

  Backups are one thing, but long term archival is another. For example, you might be required to store emails for 7 years, or keep all project data indefinitely. I used to save archives to tape, but then I've had tapes get destroyed (drives rip the tape out). So...write to 2 tapes I hear you say. Is that what others do? Have 2 (or more) tapes of the same data for redundancy? But then the other issue is that tapes cannot usually be read by different backup software vendors. Eg if you go from Arcserve - Backup Exec - Commvault over 10 years you would need to keep all 3 systems so that you could restore old data. Likewise for hardware. Old tapes might not be barcoded. Might not be compatible with the new library etc etc. So do you keep old tape hardware AND old software just in case you might need to restore a 10 year-old file? Or...when you move to a new backup system do you migrate all archived data to the new system and re-archive it onto new tapes? That could be a huge job. Any thoughts?

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• Only one domains not resolving via Windows DNS server at multiple locations, but is at others

  - by Brett G

  I'm having quite a weird issue. Had mail delivery issues to a specific domain. After looking closer, I realized that the DNS for that domain isn't resolving via the in-house Windows 2003 SP2 DNS server. C:\>nslookup foodmix.net Server: DC.DOMAIN.com Address: 10.1.1.1 DNS request timed out. timeout was 2 seconds. DNS request timed out. timeout was 2 seconds. *** Request to DC.DOMAIN.com timed-out (DC.DOMAIN.com and 10.1.1.1 are generic values to replace the actual ones) Even if I run this nslookup from the DC.DOMAIN.com server, I get the same result. However, all other requests are working as they should. I tried it on severs at completely separate organizations on different networks(Windows 2003 AD servers). The weird thing is some of these were having the same exact issue. However using public DNS servers work. I have tried clearing the DNS cache, restarting the server, restarting the services, etc. Nothing has worked. One weird event I noticed in the DNS Server Event Logs that might be related is an event ID of 5504 with the following description: The DNS server encountered an invalid domain name in a packet from 192.33.4.12. The packet will be rejected. The event data contains the DNS packet. For more information, see Help and Support Center at http://go.microsoft.com/fwlink/events.asp. In the data section below, I can see the following mentioned: ns2.webhostingstar.com Which happens to be the nameserver for the domain in question. Several discussion threads and a MS KB have pointed to disabling EDNS. I have done this via "dnscmd /config /enableednsprobes 0" and it has not fixed the issue.

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• Configure nginx for multiple node.js apps with own domains

  - by udo

  I have a node webapp up and running with my nginx on debian squeeze. Now I want to add another one with an own domain but when I do so, only the first app is served and even if I go to the second domain I simply get redirected to the first webapp. Hope you see what I did wrong here: example1.conf: upstream example1.com { server 127.0.0.1:3000; } server { listen 80; server_name www.example1.com; rewrite ^/(.*) http://example1.com/$1 permanent; } # the nginx server instance server { listen 80; server_name example1.com; access_log /var/log/nginx/example1.com/access.log; # pass the request to the node.js server with the correct headers and much more can be added, see nginx config options location / { proxy_set_header X-Real-IP $remote_addr; proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for; proxy_set_header Host $http_host; proxy_set_header X-NginX-Proxy true; proxy_pass http://example1.com; proxy_redirect off; } } example2.conf: upstream example2.com { server 127.0.0.1:1111; } server { listen 80; server_name www.example2.com; rewrite ^/(.*) http://example2.com/$1 permanent; } # the nginx server instance server { listen 80; server_name example2.com; access_log /var/log/nginx/example2.com/access.log; # pass the request to the node.js server with the correct headers and much more can be added, see nginx config options location / { proxy_set_header X-Real-IP $remote_addr; proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for; proxy_set_header Host $http_host; proxy_set_header X-NginX-Proxy true; proxy_pass http://example2.com; proxy_redirect off; } } curl simply does this: zazzl:Desktop udo$ curl -I http://example2.com/ HTTP/1.1 301 Moved Permanently Server: nginx/1.2.2 Date: Sat, 04 Aug 2012 13:46:30 GMT Content-Type: text/html Content-Length: 184 Connection: keep-alive Location: http://example1.com/ Thanks :)

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• windows 2003 under Hyper-V - can't send/receive ping

  - by glaucon

  I've installed Windows 2003 x64 R2 SP2 under Hyper-V (the Windows Pro 8 edition). I have a NIC configured but I can't move any traffic on it. In particular I can't send or receive Pings. Scoreboard There is a second VM running Ubuntu under the Windows 8 host which is able to send and receive pings from the host O/S . When I try to ping from Windows 2003 guest to Windows 8 host I get 'Request Timed Out'. When I try to ping from Windows 8 host to Windows 2003 guest I get 'Reply from 192.168.10.107 Destination Host Unreachable'. There's no problem pinging from the Ubuntu guest to the Windows 8 host and no problem pinging from the Windows 8 host to the Unbuntu guest. Environment Integration services are installed on Windows 2003. The windows 2003 needs a static IP address of 192.168.10.15. The Windows 2003 ipconfig output looks like this : While the host o/s ipconfig output looks like this : Event Logs The only things I can see in the event logs which is (a) looks signifcant and (b) is not related to the lack of networking is this : I'm not sure if that's significant or not. Hyper-V and NICs When the Windows 2003 guest was first booted it had no NIC; I subsequently added a 'Legacy Network Connector' which I couldn't get Windows 2003 to recognise; I subsequently removed that and added a 'Standard Network Connector' and at least on the surface this works ... only it doesn't. 'Virtual Network Type' is external. Although I've only mentioned ping there's no other evidence of network activity. 'Allow incoming echo request' is enabled on the Windows 2003 guest. HELP ? What else should I look at or do to resolve this problem ? EDIT 1: I should have said that I turned off the firewall on the W2003 server for a while and retested the pings; same result.

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