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• Why does my DD-WRT not accept SSH connections from my laptop?

  - by Vlad Seghete

  So, here is my system: I have a 2Wire AT&T modem/router which I use for wireless and a Buffalo router flashed with DD-WRT which is physically attached to the 2Wire and set in the DMZ. I set everything up on the DD-WRT to be able to connect to it using ssh and also so that it forwards ssh requests on a different port to one of the servers behind it. Now, when I am physically connected to the DD-WRT all this works great and as I would want it to. I ssh into the two different ports using the WAN IP of my network, and I get where I expect to land. If, however, I am connected using wi-fi to the 2Wire, the same commands do not work. I do not get an error, simply a timeout. I have trouble understanding this, since the DD-WRT is set in the DMZ and everything should pass to it. To further complicate the problem, I tried connecting to the same IP using my phone (wireless disabled, so really from the WAN) and surprise, it works! If I go back on the local network by enabling the wifi, the ssh connection times out. To make this even stranger, my WAN IP address always responds to pings (meaning in all the above situations). What could be going on here? I know what I should do, completely disable the 2wire as a router and use it strictly as a modem and them use all the routing capabilities of the dd-wrt. It's what I will probably end up doing anyway, but my question remains, because I really want to know what is happening here.

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• Loading a big database dump into PostgreSQL using cat

  - by RussH

  I have a pair of very large (~17 GB) database dumps that I want to load into postgresql 9.3. After installing the database packages, learning more or less how to use them, and fiddling around a little on various StackExchange pages (particularly this question), it looks like a proper command for me to use is something like: cat mydb.pgdump | psql mydb because of the format the dump is in. My machine has 16 GB of RAM, and I'm not familiar with the cat command but I do know that my RAM is 99% exhausted and the database is taking a while to load. My machine isn't non-responsive to the point of hanging; I can run other commands in other terminal windows and have them execute at a reasonable clip, but I am wondering if cat is the best way to pipe in the file or if something else is more efficient? My concern is that maybe cat could be using up all the RAM so the database doesn't have much to work with, throttling its performance. But I'm new to thinking about RAM issues like this and don't know if I'm worrying about nothing. Now that I think about it, this seems to be more of a question about cat and its memory usage than anything else. If there is a more appropriate forum for this question please let me know. Thanks!

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• Amazon AWS VPN how to open a port?

  - by Victor Piousbox

  I have a VPN with public and private subnets; I am considering only public subnet for now. The node 10.0.0.23, I can ssh into it. Let's say I want to connect to MySQL on the node using its private address: ubuntu@ip-10-0-0-23:/$ mysql -u root -h 10.0.0.23 ERROR 2003 (HY000): Can't connect to MySQL server on '10.0.0.23' (111) ubuntu@ip-10-0-0-23:/$ mysql -u root -h localhost Welcome to the MySQL monitor. Commands end with ; or \g. --- 8< --- snip --- 8< --- mysql> The port 3306 is not reachable if I use the private IP? My security group allows port 3306 inbound from 0.0.0.0/0 AND from 10.0.0.0/24. Outbound, allowed all. The generic setup done by Amazon through their wizard does not work... I add ACL that allows everything for everybody, still does not work. What am I missing?

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• Cisco Access switch is dropping large amount of end points

  - by user135458

  This afternoon, with no changes to the network, a switch suddenly started dropping off lots of connections. These connections would come back up a few minutes later, then another area connected to the switch would drop off. This is an older 4006 chassis switch which could in and of itself be a problem but I'm looking to see what else you all would look for in trying to find a root cause. Switch is connected via ports 1/1 and 1/2 in an etherchannel to a VSS core 1/1/42 and 2/1/42. Both sides are up and working however the CPU on the switch will spike up to 99% and that's when CRC errors start to hit the VSS core on one of those interfaces and end points start dropping off. We tried new transceivers and SFP's on each side of the link, same result. When we tried swapping the fiber patch cables on the access switch the CRC errors did not follow the fiber cables they stayed with port 1/2 on the access switch. So port 1/2 on the supervisor module looks like the culprit. We actually tried to create a new member of the ethernet channel by taking a fiber media converter to cat5 and make that a member of the port-channel but when we plugged it in you couldn't even reach the switch. I'm guessing that's unrelated and a problem with the media converter. As of right now we have left it in a state of only one fiber cable running to one side of the VSS core (1/1 Access Switch -- 2/1/42). I've sent some info into TAC and they are looking into the situation but does anyone else have any commands I could run or some troubleshooting I could look into in the meantime?

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• How can I avoid a few seconds of blank video when using -vcodec copy?

  - by arlomedia

  I'm processing user-uploaded videos on a CentOS web server with ffmpeg. I need to convert each video to a standard size and format, then extract a 30-second sample clip from each video. I want to use the "-vcodec copy" flag in the extraction command to avoid encoding a second time. This command works for my initial conversion: ffmpeg -i uploaded.mov -f mp4 -vcodec libx264 -vpre medium -acodec libfaac -r 15 -b 360k -ab 48k -ar 22050 -s 480x320 formatted.mp4 And this sometimes works for the extraction: ffmpeg -i formatted.mp4 -vcodec copy -acodec copy -ss 0 -t 30 formatted_sample.mp4 However, when I run the extraction command on some videos, the extracted sample clip starts with several seconds of blank video. The audio starts right away but the video doesn't start for 3-6 seconds. To demonstrate the problem, I've uploaded two video clips and run the above commands on them. I created the first clip in Final Cut Express and encoded it with Handbrake before uploading to the web server: 1a) uploaded clip 1b) converted with first command 1c) extracted with second command, missing first six seconds By comparison, this second clip comes from Apple's website and does not show the problem: 2a) uploaded clip 2b) converted with first command 2c) extracted with second command, no problem Can anyone see what's different about the two source clips? And if so, is there anything I can do in my conversion command so that when the extraction command runs, the clip is set up to avoid the missing video? By the way, I initially had the problem with ffmpeg 0.6.1 installed from yum, but I upgraded to the latest git version and the problem remains.

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• How to clone MySQL DB? Errors with CREATE VIEW/SHOW VIEW privileges

  - by user38071

  Running MySQL 5.0.32 on Debian 4.0 (Etch). I'm trying to clone a WordPress MySQL database completely (structure and data) on the same server. I tried doing a dump to a .sql file and an import into a new empty database from the command line, but the import fails with errors saying the user does not have the "SHOW VIEW" or "CREATE VIEW" privilege. Trying it with PHPMyAdmin doesn't work either. I also tried doing this with the MySQL root user (not named "root" though) and it shows an "Access Denied" error. I'm terribly confused as to where the problem is. Any pointers on cloning a MySQL DB and granting all privileges to a user account would be great (specifically for MySQL 5.0.32). The SHOW GRANTS command for the existing user works (the one who has privileges over the source database). It shows that the user has all privileges granted. I created a new user and database. Here's what I see with the grant commands. $ mysql -A -umyrootaccount --password=myrootaccountpassword mysql> grant all privileges on `newtarget_db`.* to 'newtestuser'@'localhost'; ERROR 1044 (42000): Access denied for user 'myrootaccount'@'localhost' to database 'newtarget_db' mysql> grant all privileges on `newtarget_db`.* to 'existingsourcedbuser'@'localhost'; ERROR 1044 (42000): Access denied for user 'myrootaccount'@'localhost' to database 'newtarget_db'

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• Pip installs on Archlinux fails to build egg

  - by stmfunk

  I was trying to install nltk on my Archlinux server but it repeatedly fails with the following error output /usr/lib/python3.3/distutils/dist.py:257: UserWarning: Unknown distribution option: 'entry_points' warnings.warn(msg) /usr/lib/python3.3/distutils/dist.py:257: UserWarning: Unknown distribution option: 'zip_safe' warnings.warn(msg) /usr/lib/python3.3/distutils/dist.py:257: UserWarning: Unknown distribution option: 'test_suite' warnings.warn(msg) usage: setup.py [global_opts] cmd1 [cmd1_opts] [cmd2 [cmd2_opts] ...] or: setup.py --help [cmd1 cmd2 ...] or: setup.py --help-commands or: setup.py cmd --help error: invalid command 'bdist_egg' /tmp/pip_build_root/nltk/distribute-0.6.21-py3.3.egg Traceback (most recent call last): File "./distribute_setup.py", line 143, in use_setuptools raise ImportError ImportError During handling of the above exception, another exception occurred: Traceback (most recent call last): File "", line 16, in File "/tmp/pip_build_root/nltk/setup.py", line 23, in distribute_setup.use_setuptools() File "./distribute_setup.py", line 145, in use_setuptools return _do_download(version, download_base, to_dir, download_delay) File "./distribute_setup.py", line 125, in _do_download _build_egg(egg, tarball, to_dir) File "./distribute_setup.py", line 116, in _build_egg raise IOError('Could not build the egg.') OSError: Could not build the egg. ---------------------------------------- Cleaning up... Command python setup.py egg_info failed with error code 1 in /tmp/pip_build_root/nltk Storing complete log in /root/.pip/pip.log This error is also occurring for matplotlib buts thats the only other library I found it to fail on so far. pyyaml installs fine. The install works perfectly under virtualenv on my mac which is using python 2.7 but the server is using python 3.3. Any help is appreciated.

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• iptables to block non-VPN-traffic if not through tun0

  - by dacrow

  I have a dedicated Webserver running Debian 6 and some Apache, Tomcat, Asterisk and Mail-stuff. Now we needed to add VPN support for a special program. We installed OpenVPN and registered with a VPN provider. The connection works well and we have a virtual tun0 interface for tunneling. To archive the goal for only tunneling a single program through VPN, we start the program with sudo -u username -g groupname command and added a iptables rule to mark all traffic coming from groupname iptables -t mangle -A OUTPUT -m owner --gid-owner groupname -j MARK --set-mark 42 Afterwards we tell iptables to to some SNAT and tell ip route to use special routing table for marked traffic packets. Problem: if the VPN failes, there is a chance that the special to-be-tunneled program communicates over the normal eth0 interface. Desired solution: All marked traffic should not be allowed to go directly through eth0, it has to go through tun0 first. I tried the following commands which didn't work: iptables -A OUTPUT -m owner --gid-owner groupname ! -o tun0 -j REJECT iptables -A OUTPUT -m owner --gid-owner groupname -o eth0 -j REJECT It might be the problem, that the above iptable-rules didn't work due to the fact, that the packets are first marked, then put into tun0 and then transmitted by eth0 while they are still marked.. I don't know how to de-mark them after in tun0 or to tell iptables, that all marked packet may pass eth0, if they where in tun0 before or if they going to the gateway of my VPN provider. Does someone has any idea to a solution? Some config infos: iptables -nL -v --line-numbers -t mangle Chain OUTPUT (policy ACCEPT 11M packets, 9798M bytes) num pkts bytes target prot opt in out source destination 1 591K 50M MARK all -- * * 0.0.0.0/0 0.0.0.0/0 owner GID match 1005 MARK set 0x2a 2 82812 6938K CONNMARK all -- * * 0.0.0.0/0 0.0.0.0/0 owner GID match 1005 CONNMARK save iptables -nL -v --line-numbers -t nat Chain POSTROUTING (policy ACCEPT 393 packets, 23908 bytes) num pkts bytes target prot opt in out source destination 1 15 1052 SNAT all -- * tun0 0.0.0.0/0 0.0.0.0/0 mark match 0x2a to:VPN_IP ip rule add from all fwmark 42 lookup 42 ip route show table 42 default via VPN_IP dev tun0

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• tab complete not working for vim in particular directory - ubuntu 12.04

  - by user1160958

  I am working on a ruby on rails app. All of the sudden the command line tab complete stopped working for vim, only for files though, and only for the vim command (i.e. works for other commands, ls, rm etc.) After further investigation - this only occurs in a specific directory, the home directory of my rails app. If I go into a sub directory in my rails app, or any other directory on my machine, the tab complete works again. If I go into the root directory of any other rails app, it works. I also tried renaming the diretory, and copying the contents of the directory to another directory, and that did not work either. It only does not work for files, and works for any other command - ls, rm etc. But when I do vim /path/to/file/, then tab to see a list of files in that directory, only other directories show, not files. I am using ubuntu 12.04. Also, I tried re-installing vim, re-booting, removing ~/.viminfo (there was no vimrc file) that didn't work. Any help would be appreciated!

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• Clarification for setting up SSH terminal access on Cisco IOS

  - by Matt Malesky

  I'm attempting to set up SSH on a Cisco 2811 and having some difficulties. The first step to this should be running crypto key generate rsa I seem to be missing this though: better#crypto key generate rsa ^ % Invalid input detected at '^' marker. better# Furthermore, the only available commands I have in the crypto key namespace are lock and unlock, which seem to indicate a locked keypair (for which I don't know the password): better#crypto key ? lock Lock a keypair. unlock Unlock a keypair. better#crypto key unlock ? rsa RSA keys better#crypto key unlock rsa %% Please enter the passphrase: %% Unlocking failed. . better# More or less, I'm asking what exactly this might mean, and if I actually do have certificates already here (used router)? Otherwise, how can I solve this? It's my first time configuring this feature, but I definitely believe it's part of my IOS. Speaking of my IOS, I'm running the image c2800nm-advsecurityk9-mz.124-24.T6.bin I'll also note that I have my hostname and ip domain-name configured. I'll also give you a dir flash: below if it's at all of use: better#dir flash: Directory of flash:/ 2 -rw- 2748 Jul 27 2009 14:03:52 +00:00 sdmconfig-2811.cfg 3 -rw- 931840 Jul 27 2009 14:04:10 +00:00 es.tar 4 -rw- 1505280 Jul 27 2009 14:04:32 +00:00 common.tar 5 -rw- 1038 Jul 27 2009 14:04:46 +00:00 home.shtml 6 -rw- 112640 Jul 27 2009 14:05:00 +00:00 home.tar 7 -rw- 1697952 Jul 27 2009 14:05:26 +00:00 securedesktop-ios-3.1.1.45-k9.pkg 8 -rw- 415956 Jul 27 2009 14:05:46 +00:00 sslclient-win-1.1.4.176.pkg 9 -rw- 38732900 Dec 8 2011 06:28:56 +00:00 c2800nm-advsecurityk9-mz.124-24.T6.bin 64016384 bytes total (20598784 bytes free) better#

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• Amazon EC2 Nat Instance - goes out but not back in

  - by nocode

  I've followed Amazon's steps and list what I've done. I've created 6 subnets (4 private SN1: 10.50.1.0/24, SN2: 10.50.2.0/24, SN3: 10.50.3.0/24, SN4: 10.50.4.0/24) and 2 public (SN5: 10.50.101.0/24 and SN6: 10.50.102.0/24) -I have a Bastion host and a NAT instance on SN5 and assigned EIP's to both. I created a test instance on SN1. edit: -NAT instance has source/destination check disabled -On the NAT instance, I had enabled the following commands to be bootstrapped: echo 1 > /proc/sys/net/ipv4/ip_forward iptables -t nat -A POSTROUTING -s 10.0.0.0/16 -j MASQUERADE -In my VPC, the private subnets have their own route table and configured 0.0.0.0/0 to the NAT instance with 4 subnets being associated with the route table. I have a second route table for my public subnets and 0.0.0.0/16 is pointed towards the IGW (with the other 2 subnets associated with it). -For Security Groups, I have the NAT instance accepting all traffic on each of the 4 subnets and all OUTBOUND traffic is allowed. For my test server, I have allowed all outbound access and have allowed all traffic from the public subnet of the NAT host. I can ping internally with no issues. On my test instance, if I try to ping google.com, DNS resolves however I don't get a reply back. On my NAT instance, I run a tcpdump and can see the request being requested to google.com but it's not sending the reply back. My NAT host can ping and receive a reply from google. From the test host, when I ping the NAT instance, the tcpdump shows a request and receive. Is there something I'm missing? EDIT: I've figured it out - I had to save the iptable config and restart the service.

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• conflicting info about the running kernel version in FreeBSD

  - by John

  I asked a related question about uname before, now want to ask from another angle because the following simple yet obvious conflicting outputs may mean there is something many people did not think of (me included). I'm running FreeBSD 9 RELEASE, please see the following commands: # sysctl kern.bootfile kern.bootfile: /boot/kernel/kernel # strings /boot/kernel/kernel |grep RELEASE|grep 9 @(#)FreeBSD 9.2-RELEASE-p7 #0: Tue Jun 3 11:05:13 UTC 2014 FreeBSD 9.2-RELEASE-p7 #0: Tue Jun 3 11:05:13 UTC 2014 9.2-RELEASE-p7 The above kernel file suggests the running kernel is 9.2-RELEASE-p7. But... # dmesg Copyright (c) 1992-2012 The FreeBSD Project. Copyright (c) 1979, 1980, 1983, 1986, 1988, 1989, 1991, 1992, 1993, 1994 The Regents of the University of California. All rights reserved. FreeBSD is a registered trademark of The FreeBSD Foundation. FreeBSD 9.1-RELEASE #0 r243825: Tue Dec 4 09:23:10 UTC 2012 ... # uname -a FreeBSD localhost.localdomain 9.1-RELEASE FreeBSD 9.1-RELEASE #0 r243825: Tue Dec 4 09:23:10 UTC 2012 [email protected]:/usr/obj/usr/src/sys/GENERIC amd64 So dmesg and uname says it's 9.1-RELEASE. I also did an extensive find / -type f -exec grep -l "9.1-RELEASE" {} \; but found no possible kernel file that contains 9.1-RELEASE. What could lead to the above conflict, and what kernel I am actually running? Please note I run RELEASE and ran freebsd-update to do binary update, so no compiled kernel is involved. And I have rebooted multiple times after freebsd-update. And the system is not in jail etc, just the only system on that computer.

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• Server Clustering (Django, Apache, Nginx, Postgres)

  - by system-matrix

  I have a project deployed with django, Apache, Nginx and Postgres. The project has requirement of live data viewable to customers. The projects main points are: 1. Devices in field send data to server(devices are also like website users) after login. 2. There is background import process which imports the uploaded data in postgres. 3. The webusers of the system use this data and can send commands to the devices, which devices read when they login. 4. There are also background analysis routines running on the data. All the above mentioned setup and system is deployed on one amazon EC2 cloud machine. The project currently supports over 600 devices and 400 users. But as the number of devices are increasing with time the performance of the server is going down. We want to extend this project so that it can support more and more devices. My initial thinking is, We will create one more server like current one and divide the devices amongst these to servers. But Again We need a central user and device managment point though django admin. Any Ideas? What are the best possible ways to create a scalable architecture? How can I create a Postgres Cluster and Use it with Django, if possible?

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• TC hashing filters - single rule deletion

  - by exa

  For traffic shaping I'm currently using a setup that looks exactly like the setup from LARTC, on this page: http://lartc.org/howto/lartc.adv-filter.hashing.html I have a simple problem with that - everytime I want to modify something in the hash table (like assign a IP to different flowid), I need to delete the whole filter table and add it again filter by filter. (I actually don't do it by hand, I have a nice program that does it for me... but still...) There is a problem - I got roughly 10k filters allocated this way and deleting and refilling the whole filtertable can get pretty lengthy, which is not exactly good for traffic shaping. My program could easily manage to delete only the rules that need to be deleted (thus reducing the whole problem to several commands and miliseconds), but I simply don't know the command that deletes only the one hashing rule. My tc filter show: filter parent 1: protocol ip pref 1 u32 filter parent 1: protocol ip pref 1 u32 fh 2: ht divisor 256 filter parent 1: protocol ip pref 1 u32 fh 2:a:800 order 2048 key ht 2 bkt a flowid 1:101 match 0a0a0a0a/ffffffff at 16 filter parent 1: protocol ip pref 1 u32 fh 2:c:800 order 2048 key ht 2 bkt c flowid 1:102 match 0a0a0a0c/ffffffff at 16 filter parent 1: protocol ip pref 1 u32 fh 800: ht divisor 1 filter parent 1: protocol ip pref 1 u32 fh 800::800 order 2048 key ht 800 bkt 0 link 2: match 00000000/00000000 at 16 hash mask 000000ff at 16 The wish: 'tc filter del ...' command that removes only one specific filter (for example the 0a0a0a0a IP match (IP address 10.10.10.10)). Removal of some small subgroup would also be good - for example I could still recreate a bucket (bkt a) pretty fast. My attempts: I tried to number all the filters using prio, but with no help -- they just create something unusuable (but deletable) below, but the bucketed filters remain there after that gets deleted. Any ideas? edit - I'm adding a simplified tl;dr description of the problem: I created hash filter on some interfce just like in this http://lartc.org/howto/lartc.adv-filter.hashing.html I want to find a command that deletes one rule (e.g. 1.2.1.123) from the table, leaving the rest untouched and working.

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• How can I switch from a custom linux network namespace back to the default one?

  - by Martin

  With ip netns exec you can execute a command in a custom network namespace - but is there also a way to execute a command in the default namespace? For example, after executing these two commands: sudo ip netns add test_ns sudo ip netns exec test_ns bash How can the newly created bash execute programs in the default network namespace? There is no ip netns exec default or anything similar as far as I've found. My scenario is: I want to run a SSH server in a separate network namespace (to keep the rest of the system unaware of the network connection, as the system is used for network testing), but want to be able to execute programs in the default network namespace via the SSH connection. What I've found out so far: Created network namespaces are listed as files under /var/run/netns (but there is no file for the default namespace) The ip netns exec code can be found here: http://git.kernel.org/cgit/linux/kernel/git/shemminger/iproute2.git/tree/ip/ipnetns.c#n132 - I haven't grasped everything that it is doing yet, but it doesn't look very promising. ip netns identify $$ as suggested by Howto query and change network namespace on linux? returns nothing when in the default network namespace

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• Win7 - Opening "Programs and Features" as Admin from command line (logged in as regular user)

  - by user1741264

  We have Win7 machines on a domain that we'd like to open the "Programs and Features" control applet via the command line while a regular user is logged in. Heres the catch: I know how to do this using runas from command line BUT after "Programs and Features" opens, I dont truly have the ability to remove a program. I am told that I need to be an Admin to do so. Here are the commands I have tried: runas /user:%computername%\administrator cmd.exe then in the new cmd window running: control appwiz.cpl runas /user:%companydomain%\%domainadminacct% cmd.exe then in the new cmd window running: control appwiz.cpl runas /user:%computername%\administrator cmd.exe then in the new cmd window running: rundll32.exe shell32.dll,Control_RunDLL appwiz.cpl runas /user:%companydomain%\%domainadminacct% cmd.exe then in the new cmd window running: rundll32.exe shell32.dll,Control_RunDLL appwiz.cpl I have also tried all of the above as one long line of code instead of launching a cmd.exe as Admin As you can see, I have tried running the command using both a local admin account (Administrator) AND a domain admin account. I have alos tried launching the runas command as one long command (opening the "programs and features") AND 1st launching a cmd.exe with admin rights and THEN launching the "Prgrams and Features" window. The result is the same: The "Programs and Features" windows opens but when I try to perform an uninstall, I am told I need Admin rights. Thus I am lead to believe that this instance of "Programs and Features" is not truly being run as an admin I am trying to avoid logging the regular user out. I am also aware that every program has its own uninstaller, I do not want to uninstall that way. I want to use the uninstaller in "Programs and Features". Any help is appreciated.

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• How to test a HTTPS URL with a given IP address

  - by GreatFire

  Let's say a website is load-balanced between several servers. I want to run a command to test whether it's working, such as curl DOMAIN.TLD. So, to isolate each IP address, I specify the IP manually. But many websites may be hosted on the server, so I still provide a host header, like this: curl IP_ADDRESS -H 'Host: DOMAIN.TLD'. In my understanding, these two commands create the exact same HTTP request. The only difference is that in the latter one I take out the DNS lookup part from cURL and do this manually (please correct me if I'm wrong). All well so far. But now I want to do the same for an HTTPS url. Again, I could test it like this curl https://DOMAIN.TLD. But I want to specify the IP manually, so I run curl https://IP_ADDRESS -H 'Host: DOMAIN.TLD'. Now I get a cURL error: curl: (51) SSL: certificate subject name 'DOMAIN.TLD' does not match target host name 'IP_ADDRESS'. I can of course get around this by telling cURL not to care about the certificate (the "-k" option) but it's not ideal. Is there a way to isolate the IP address being connected to from the host being certified by SSL?

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• SSH Interactive mode not working

  - by Ekin Koc

  I have a Debian based linux server running for a year or so, without any problems. A couple of days ago, ssh interactive mode stopped working for no reason. I mean, I can open an ssh connection just fine, the server greets me with shell but I just can't type anything. However, if I send commands like this: ssh [email protected] cat /var/log/messages, I get the response. I dug through several logs and found one message, which feels remotely relevant to the problem; sh kernel: [10222733.062511] ------------[ cut here ]------------ sh kernel: [10222733.062522] WARNING: at /build/buildd-linux-2.6_2.6.32-39-amd64-7yVIH2/linux-2.6-2.6.32/debian/build/source_amd64_none/drivers/char/tty_ldisc.c:738 tty_ldisc_reinit+0x46/0x7b() sh kernel: [10222733.062526] Hardware name: PowerEdge R210 II sh kernel: [10222733.062528] Modules linked in: ipt_MASQUERADE iptable_nat nf_nat nf_conntrack_ipv4 nf_conntrack nf_defrag_ipv4 ip_tables x_tables sha1_generic arc4 ecb ppp_mppe ppp_async crc_ccitt ppp_generic slhc loop snd_pcm snd_timer snd soundcore snd_page_alloc i2c_i801 i2c_core pcspkr evdev joydev dcdbas container button processor ext3 jbd mbcache sg sd_mod sr_mod crc_t10dif cdrom usb_storage usbhid hid mpt2sas ahci ehci_hcd libata scsi_transport_sas usbcore bnx2 nls_base scsi_mod fan thermal thermal_sys [last unloaded: scsi_wait_scan] sh kernel: [10222733.062568] Pid: 8662, comm: sshd Not tainted 2.6.32-5-amd64 #1 sh kernel: [10222733.062569] Call Trace: sh kernel: [10222733.062572] [<ffffffff811ff056>] ? tty_ldisc_reinit+0x46/0x7b sh kernel: [10222733.062574] [<ffffffff811ff056>] ? tty_ldisc_reinit+0x46/0x7b Is there any way to get back the sshd working in interactive mode? I tried restarting sshd but that is no help. And somehow, I can not reboot the server. Tried sending shutdown -r now and reboot but it refuses to go down. Should I go ahead and request a physical reboot?

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• git : The remote end hung up unexpectedly - too many simultaneous users?

  - by Pritam Barhate

  I asked this first on StackOverflow and I was suggested that I should ask it here: We have a self hosted git server (Gitolite) on a VPS account (CPU:2.68GHz RAM:1824MB). This same VPS is also used to publish our underdevelopment web apps for client demos. (Very little traffic). so the main use of the server is as a Git Server Only. This git server is accessed by a team of 30-40 people for various projects. Our problem is that during the day when 6-7 people are trying to access the server (sometimes same repo) we get frequent error message: ssh: connect to host xxx.xxx.xx.xx port 22: Bad file number fatal: The remote end hung up unexpectedly After trying for 10-15 minutes it generally succeeds. During early mornings and late nights when there are only 1-2 people, git commands work with 100% success rate. Also I would like to note that if I access the other file hosted on the server through HTTP it works fine. I found a couple of questions on StackOverflow and on other sites regarding this. But most of the people point towards SSH key set up or conflicts between Msysgit and Cygns SSH. However I don't think this is the problem in our case as we get this behavior on Windows (using msysgit only) as well as Mac Machines. Also if it was SSH configuration issue then it shouldn't work at all. But in our case it works after 10-15 minutes. I think in our case it might be too many simultaneous connections to same server (or same repo) or something like that. Does there exists a setting or a conf file that needs to modified to solve this problem? Please help me solve this problem or point me in the right direction. Thanks in advance. Pritam.

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• Ubuntu Natty 11.04, Turning the wireless switch off; switches it off permanently!

  - by ZiGi

  i'm using an hp pavilion dv2000 i turned the wifi switch off by mistake, the LED turned orange and the wifi got disconnected. and now when i turn the switch on, it remains orange and the wifi still isn't functional. this happened before; i found a fix that worked searching google. it was done via terminal commands and i didn't have to download anything but i can't find the solution anymore! wlan0 shows up when i use: :~$iwconfig #BLA BLA BLA #... wlan0 IEEE 802.11abg ESSID:off/any Mode:Managed Access Point: Not-Associated Tx-Power=off Retry long limit:7 RTS thr:off Fragment thr:off Power Management:off more results: :~$ sudo ifconfig wlan0 up SIOCSIFFLAGS: Operation not possible due to RF-kill :~$ rfkill list all 1: phy0: WirelessLAN Soft blocked: yes Hard blocked: yes :~$ sudo rfkill unblock all :~$ rfkill list all 1: phy0: WirelessLAN Soft blocked: no Hard blocked: yes :~$ sudo ifconfig wlan0 up SIOCSIFFLAGS: Operation not possible due to RF-kill it's still hard blocked! even though the switch is turned on; gives the same result eitherways a direction to a page with a working solution is a much appreciated answer!

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• How to create a init.d script for openssh-server which was compiled and installed from source using configure + make + make install?

  - by Patrick L

  I have installed openssh-server in my Ubuntu PC using apt-get install openssh-server. The version is 5.9. Now, I would like to compile and install openssh-server version 6.2 from source codes. I have successfully downloaded the source codes, and run the following commands: ./configure make make install I found that the new version of openssh-server was installed into /usr/local/sbin/. The old version of openssh-server is in /usr/sbin/. I found that the service script in /etc/init.d/ssh is still pointing to /usr/sbin/. And the old openssh-server (v5.9) is still running. How can I replace the old openssh-server with the new openssh-server that I have just compiled and installed? How can I create a init.d script to start and stop the new openssh-server that I've compiled from source manually? How to start the new openssh-server on boot? When I install openssh-server using apt-get install, the config files will be installed into /etc/ssh/. If I compile and install it from source, where is the config file? If I compiled openssh-server from source, but I install openssh-client package using apt-get install, will there be any config files conflict? Thanks.

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• Which AMI to to use for Java/Tomcat/MySQL in Amazon EC2?

  - by Justin

  I originally posted this on stackoverflow.com and it was suggested serverfault.com might be a better place to ask this question. So here goes: I'm trying to determine which Amazon Machine Image (AMI) to use as my Virtual Server in Amazon's EC2. For now, I'll need to choose an AMI that complies with the AWS Free Usage Tier. I want to deploy a Java app that I've been developing using Eclipse on Windows XP, Tomcat 7 and MySQL 5.5. I'm aware that I can choose the Basic 32-bit Amazon Linux AMI. Then I'd manually install Tomcat and MySQL (does MySQL get installed on the image or separately on an Elastic Block Store (EBS)?). Here's the rub, I'm a bit of a Linux noob. I can start Tomcat and tail the logs and such on Linux but I'm not familiar with the install process for Tomcat and MySQL on Linux and commands like sudo and chmod. I'm happy to get more hands on with Linux but I'm short on time right now. Are there AMI's that already have Tomcat and MySQL bundled? The Request Instance Wizard shows 805 Community AMI's that are Free Tier Eligible. 51 of the Free Tier Eligible AMI's have "Tomcat" in their name. I'm willing to consider using Elastic Beanstalk but my research thus far hasn't found any discussion of using MySQL with Beanstalk. The discussions all seem to use Amazon's SimpleDB. Any advice is greatly appreciated.

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• Sudden problems with iptables not running

  - by Fourjays

  I've got a sudden issue with iptables not running on my CentOS 5.8/DirectAdmin XenVPS. All I have done today is install PHP APC and run an update (although I admittedly didn't pay much attention today - I usually do). Iptables has been running fairly smoothly since I installed it over 6 months ago. Basically when I try to run iptables -L it tells me: iptables v1.3.5: can't initialize iptables table `filter': iptables who? (do you need to insmod?) Perhaps iptables or your kernel needs to be upgraded. I've looked around and tried a few things and it appears that maybe my kernel doesn't have the modules loaded? I've been reading this and tried the two commands they suggest to no avail. Except there does appear to be a mismatch on one bit of output: -bash-3.2# cd /lib/modules -bash-3.2# ls 2.6.18-194.32.1.el5xen 2.6.18-238.5.1.el5xen 2.6.18-274.7.1.el5xen 2.6.39.1-cs-domU 2.6.18-238.12.1.el5xen 2.6.18-238.9.1.el5xen 2.6.37.2-cs-domU 3.0.1-cs-domU -bash-3.2# depmod -a WARNING: Couldn't open directory /lib/modules/2.6.18-274.18.1.el5xen: No such file or directory FATAL: Could not open /lib/modules/2.6.18-274.18.1.el5xen/modules.dep.temp for writing: No such file or directory Does this mean the versions are out of sync? If so, what are my next steps to getting this fixed? As you can probably tell I am still learning how to manage my server so please be very clear in all advice. Many thanks :)

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• Using VMware Guest OS to enable Host OS to ssh to remote network

  - by Reuben L.

  Basically I have an issue because my host OS is 64-bit Linux Mint (Ubuntu derived) and it doesn't seem to be compatible with the Juniper Network Connect that is used by the network at my workplace. Thus, I am unable to ssh from terminal to the network. I can't make changes to the workplace network either so that leaves me with looking for solutions on my end. The main reason for me to access the network from home is to check on my running processes or to issue more commands to a few workstations. Putty is the desperate choice I usually make but it means I have to reboot to Windows and also have limited control. I've tried several other methods and they have all failed. Recently, I setup a VM with Windows 7 as the guest OS. Now half my problems are fixed as I don't have to physically reboot the system - I just have to engage Juniper Network Connect on the VM. However, I would still like to use my Linux terminal to ssh to the network. It sounds plausible that I could somehow manipulate ports to connect to the remote network from the host OS tunneled through the guest OS, but I really have no clue how to do so... Can anyone help?

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• HTC Diamond Touch sync problem

  - by Anders

  I have a HTC Diamond Touch with all my contacts etc. on it. Did however not use it for 6mo while being abroad. When I start the phone now I realize that the touch screen has stopped working. I have tried restarting, soft resetting, shutting it off etc but the touch just wont follow commands. However, I can manage the phone by buttons so it's not frozen. Hence I can get into the phone and watch contacts but not use it to call etc. The problem is, how do I get my 300 contacts out of the thing!? When I'm plugging in the phone, it lets me choose between "Sync with Outlook" and "Use as storage device". It automatically selects "Use as storage device". Now, I cannot choose to sync it with the buttons. I can not change this option afterwards either. In short, I have a phone with all of my contact data and am completely unable to get that out of it. Any tips/help/suggestions? If possible, preferably one that does not including sending the phone to a hardware workshop for three weeks in order to get it fixed:)

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