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  • What kind of “sysadmin stuff” should I show to students during a talk?

    - by Gregory Eric Sanderaon
    A teacher asked me If I could talk about my job as a linux sysadmin in his class. The course is called "Introduction to Operating systems" and i've been given 45 minutes to talk. The students are beginning their second year, so they've had a bit of experience with programming in different languages. What i'm like to do is show a series of hands-on examples of the kinds of things I do on a regular basis. I've already got a few ideas jotted down, but I'm afraid that they might be either too advanced or too simple for the students to appreciate. Another concern is that a topic might be too long to explain and use too much time overall. Here are a few ideas : Program deployment using version control (git in my case) filtering apache logs using grep, awk, uniq, tail A couple of bash scripts that i've made for various stuff on servers live montitoring (htop, iotop, iptraf) creating databases and assigning roles in mysql/postgresql So, are these ideas any good ? Do you have better ideas ? are the ideas too simple and should I go for more "advanced" stuff ?

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  • Reverse SSH Tunnel

    - by chris
    I am trying to forward web traffic from a remote server to my local machine in order to test out some API integration (tropo, paypal, etc). Basically, I'm trying to setup something similar to what tunnlr.com provides. I've initiated the ssh tunnel with the command $ssh –nNT –R :7777:localhost:5000 user@server Then I can see that server has is now listening on port 7777 with user@server:$netstat -ant | grep 7777 tcp 0 0 127.0.0.1:7777 0.0.0.0:* LISTEN tcp6 0 0 ::1:7777 :::* LISTEN $user@server:curl localhost:7777 Hello from local machine So that works fine. The curl request is actually served from the local machine. Now, how do I enable server.com:8888 to be routed through that tunnel? I've tried using nginx like so: upstream tunnel { server 0.0.0.0:7777; } server { listen 8888; server_name server.com; location / { access_log /var/log/nginx/tunnel-access.log; error_log /var/log/nginx/tunnel-error.log; proxy_pass http://tunnel; proxy_set_header Host $host; proxy_set_header X-Real-IP $remote_addr; proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for; proxy_redirect off; } } From the nginx error log I see: [error] 11389#0: *1 connect() failed (111: Connection refused) I've been looking at trying to use iptables, but haven't made any progress. iptables seems like a more elegant solution than running nginx just for tunneling. Any help is greatly appreciated. Thanks!

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  • How to figure out how much RAM each prefork thread requires for maximum Wordpress performance on an EC2 small instance

    - by two7s_clash
    Just read Making WordPress Stable on EC2-Micro In the "Tuning Apache" section, I can't quite figure out how he comes up with his numbers for his prefork config. He explains how to get the numbers for an average process, which I get. But then: Or roughly 53MB per process...In this case, ten threads should be safe. This means that if we receive more than ten simultaneous requests, the other requests will be queued until a worker thread is available. In order to maximize performance, we will also configure the system to have this number of threads available all of the time. From 53MB per process, with 613MB of RAM, he somehow gets this config, which I don't get: <IfModule prefork.c> StartServers 10 MinSpareServers 10 MaxSpareServers 10 MaxClients 10 MaxRequestsPerChild 4000 </IfModule> How exactly does he get this from 53MB per process, with 613MB limit? Bonus question From the below, on a small instance (1.7 GB memory), what would good settings be? bitnami@ip-10-203-39-166:~$ ps xav |grep httpd 1411 ? Ss 0:00 2 0 114928 15436 0.8 /opt/bitnami/apache2/bin/httpd -f /opt/bitnami/apache2/conf/httpd.conf 1415 ? S 0:06 10 0 125860 55900 3.1 /opt/bitnami/apache2/bin/httpd -f /opt/bitnami/apache2/conf/httpd.conf 1426 ? S 0:08 19 0 127000 62996 3.5 /opt/bitnami/apache2/bin/httpd -f /opt/bitnami/apache2/conf/httpd.conf 1446 ? S 0:05 48 0 131932 72792 4.1 /opt/bitnami/apache2/bin/httpd -f /opt/bitnami/apache2/conf/httpd.conf 1513 ? S 0:05 7 0 125672 54840 3.1 /opt/bitnami/apache2/bin/httpd -f /opt/bitnami/apache2/conf/httpd.conf 1516 ? S 0:02 2 0 125228 48680 2.7 /opt/bitnami/apache2/bin/httpd -f /opt/bitnami/apache2/conf/httpd.conf 1517 ? S 0:06 2 0 127004 55796 3.1 /opt/bitnami/apache2/bin/httpd -f /opt/bitnami/apache2/conf/httpd.conf 1518 ? S 0:03 1 0 127196 54208 3.0 /opt/bitnami/apache2/bin/httpd -f /opt/bitnami/apache2/conf/httpd.conf 1531 ? R 0:04 0 0 127500 54236 3.0 /opt/bitnami/apache2/bin/httpd -f /opt/bitnami/apache2/conf/httpd.conf

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  • Bind9 configured to start at boot, has to be started manually

    - by antik
    I've configured bind9 on my system and it works great when it runs. It's currently configured to be run at runlevel 2 by setting: $ sudo update-rc.d bind9 enable 2 This appears to have done its work: $ tree -f /etc/rc?.d | grep -e ".*bind9$" |-- /etc/rc0.d/K85bind9 -> ../init.d/bind9 |-- /etc/rc2.d/S15bind9 -> ../init.d/bind9 |-- /etc/rc3.d/S15bind9 -> ../init.d/bind9 |-- /etc/rc4.d/S15bind9 -> ../init.d/bind9 |-- /etc/rc5.d/S15bind9 -> ../init.d/bind9 |-- /etc/rc6.d/K85bind9 -> ../init.d/bind9 Booting the system, I believe I am at runlevel 2: $ runlevel N 2 Given the above configuration, when the system is rebooted, bind does not come up. Only on occasion, for some reason, can I resolve hostnames immediately after startup. Far more often than not however, I cannot. I can interrogate the service's status: $ sudo /etc/init.d/bind9 status * could not access PID file for bind9 When the service doesn't start, I can start it successfully via a terminal by issuing $ sudo /etc/init.d/bind9 start And it works great from then on. Loopback configuration: $ ifconfig lo 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:16436 Metric:1 RX packets:1872 errors:0 dropped:0 overruns:0 frame:0 TX packets:1872 errors:0 dropped:0 overruns:0 carrier:0 collisions:0 txqueuelen:0 RX bytes:220205 (220.2 KB) TX bytes:220205 (220.2 KB) Do I have my startup misconfigured? (I'm used to Gentoo so Ubuntu's model is still a little new to me) I'm not seeing any log indication of a failed attempt to start at boot in syslog. Is there someplace else I should be looking? What else should I look into to get bind working at startup?

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  • Cannot install jdk 1.5 on Ubuntu 12.04

    - by u123
    I have installed Ubuntu 12.04.1 LTS (GNU/Linux 3.2.0-23-generic x86_64). Some info about the machine: $ grep --color "model name" /proc/cpuinfo model name : Intel(R) Xeon(R) CPU E5430 @ 2.66GHz model name : Intel(R) Xeon(R) CPU E5430 @ 2.66GHz model name : Intel(R) Xeon(R) CPU E5430 @ 2.66GHz model name : Intel(R) Xeon(R) CPU E5430 @ 2.66GHz I need to install jdk5 to support an old application. I have tried: ~$ sudo apt-get install openjdk-5-jdk Reading package lists... Done Building dependency tree Reading state information... Done E: Unable to locate package openjdk-5-jdk I have also tried: ~$ sudo apt-get install sun-java5-jdk Reading package lists... Done Building dependency tree Reading state information... Done E: Unable to locate package sun-java5-jdk So its not available in the repos. I have tried to follow this guide (adding the jaunty repos): http://leonardo-pinho.blogspot.dk/2010/11/java-15-no-ubuntu-1010.html but same result. Then I have tried to download jdk-1_5_0_22-linux-i586.bin from here: http://www.oracle.com/technetwork/java/javasebusiness/downloads/java-archive-downloads-javase5-419410.html#jdk-1.5.0_22-oth-JPR and do: ~$ chmod a+x jdk-1_5_0_22-linux-i586.bin ~$ sudo ./jdk-1_5_0_22-linux-i586.bin Sun Microsystems, Inc. Binary Code License Agreement yes Unpacking... Checksumming... 0 0 Extracting... ./jdk-1_5_0_22-linux-i586.bin: 424: ./jdk-1_5_0_22-linux-i586.bin: ./install.sfx.19556: not found ./jdk-1_5_0_22-linux-i586.bin: 1: cd: can't cd to jdk1.5.0_22 Any suggestions?

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  • NFS: Server says "authenticated mount request", but client sees "access denied"

    - by zigdon
    I have two machine, an NFS server (RHEL) and a client (Debian). The server has NFS set up, exporting a particular directory: server:~$ sudo /usr/sbin/rpcinfo -p localhost program vers proto port 100000 2 tcp 111 portmapper 100000 2 udp 111 portmapper 100024 1 udp 910 status 100024 1 tcp 913 status 100021 1 udp 53391 nlockmgr 100021 3 udp 53391 nlockmgr 100021 4 udp 53391 nlockmgr 100021 1 tcp 32774 nlockmgr 100021 3 tcp 32774 nlockmgr 100021 4 tcp 32774 nlockmgr 100007 2 udp 830 ypbind 100007 1 udp 830 ypbind 100007 2 tcp 833 ypbind 100007 1 tcp 833 ypbind 100011 1 udp 999 rquotad 100011 2 udp 999 rquotad 100011 1 tcp 1002 rquotad 100011 2 tcp 1002 rquotad 100003 2 udp 2049 nfs 100003 3 udp 2049 nfs 100003 4 udp 2049 nfs 100003 2 tcp 2049 nfs 100003 3 tcp 2049 nfs 100003 4 tcp 2049 nfs 100005 1 udp 1013 mountd 100005 1 tcp 1016 mountd 100005 2 udp 1013 mountd 100005 2 tcp 1016 mountd 100005 3 udp 1013 mountd 100005 3 tcp 1016 mountd server$ cat /etc/exports /dir *.my.domain.com(ro) client$ grep dir /etc/fstab server.my.domain.com:/dir /dir nfs tcp,soft,bg,noauto,ro 0 0 All seems well, but when I try to mount, I see the following: client$ sudo mount /dir mount.nfs: access denied by server while mounting server.my.domain.com:/dir And on the server I see: server$ tail /var/log/messages Mar 15 13:46:23 server mountd[413]: authenticated mount request from client.my.domain.com:723 for /dir (/dir) What am I missing here? How should I be debugging this?

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  • nmap on my webserver shows TCP ports 554 and 7070 open

    - by atc
    I have a webserver that hosts various websites for me. The two services that are accessible outside are SSH and Apache2. These are running on a non-standard and standard port, respectively. All other ports are closed explicitly via arno-iptables-firewall. The host is running Debian Testing. I noticed that a scan of the host using nmap produced different results from different PCs. From my laptop on my home network (behind a BT Homehub), I get the following: Not shown: 996 filtered ports PORT STATE SERVICE 80/tcp open http 554/tcp open rtsp 7070/tcp open realserver 9000/tcp open cslistener whereas scanning from a US-based server with nmap 5.00 and a Linux box in Norway running nmap 5.21 I get the following: Not shown: 998 filtered ports PORT STATE SERVICE 80/tcp open http 9000/tcp open cslistener so I hope it's my internal network or ISP that's playing up, but I cannot be sure. Running a netstat -l | grep 7070 produces nothing. Similarly for port 554. Can anyone explain the peculiarities I'm seeing?

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  • VMware Fusion configuration files missing

    - by jdmuys
    I need to set up port forwarding to my VM in Fusion 5. Everywhere on the net, the solution is described as editing the file: /Library/Application Support/VMware Fusion/vmnet8/nat.conf However, on my install, that file doesn't exist. Neither does the vmnet8 directory. Here is the full content of VMware stuff I have in /Library/Application Support/: /Library/Application Support/ VMware/ VMware Fusion AdminWritable Shared vmInventory usbarb.rules VMware Fusion That's right: /Library/Application Support/VMware Fusion/ exists but is empty. And there is no VMware folder in other Library directories on my system. I am running OS X 10.8.2. I just reinstalled Fusion 5.02, no change. Meanwhile, I have 3 VMs that work just fine. So how am I supposed to set up port forwarding with Fusion 5? Thanks, JD Edit: in a hunch, I tried ps ax | grep natd which returned: 9646 ?? S 0:00.01 /Applications/VMware Fusion.app/Contents/Library/vmnet-natd -s 7 -m /Library/Preferences/VMware Fusion/vmnet8/nat.mac -c /Library/Preferences/VMware Fusion/vmnet8/nat.conf So it seems that the configurations files are now in the directory /Library/Preferences/VMware Fusion. I'll work from here and edit this question as I make progress.

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  • X11 performance problem after upgrading from Centos3 to Centos5 with an ATI Rage XL

    - by Marcelo Santos
    After upgrading a computer from Centos3 to Centos5 an application that does a lot of scrolling took a very high performance hit. top tells me that X is using a lot of CPU and that was not happening before. The machine has an ATI Rage XL with 8MB and X is using the ati driver as there is no proprietary ATI driver for this board on linux. The xorg.conf: Section "Device" Identifier "Videocard0" Driver "ati" EndSection Section "Screen" Identifier "Screen0" Device "Videocard0" DefaultDepth 24 SubSection "Display" Viewport 0 0 Depth 24 Modes "1024x768" "800x600" "640x480" EndSubSection EndSection Section "DRI" Group 0 Mode 0666 EndSection A similar machine that still has Centos3 installed is able to start DRI on the X server while this one is not, this is the Xorg.0.log for the Centos5 machine: drmOpenDevice: node name is /dev/dri/card0 drmOpenDevice: open result is -1, (No such device or address) drmOpenDevice: open result is -1, (No such device or address) drmOpenDevice: Open failed drmOpenDevice: node name is /dev/dri/card0 drmOpenDevice: open result is -1, (No such device or address) drmOpenDevice: open result is -1, (No such device or address) drmOpenDevice: Open failed [drm] failed to load kernel module "mach64" (II) ATI(0): [drm] drmOpen failed (EE) ATI(0): [dri] DRIScreenInit Failed (II) ATI(0): Largest offscreen areas (with overlaps): (II) ATI(0): 1024 x 1279 rectangle at 0,768 (II) ATI(0): 768 x 1280 rectangle at 0,768 (II) ATI(0): Using XFree86 Acceleration Architecture (XAA) Screen to screen bit blits Solid filled rectangles 8x8 mono pattern filled rectangles Indirect CPU to Screen color expansion Solid Lines Offscreen Pixmaps Setting up tile and stipple cache: 32 128x128 slots 10 256x256 slots (==) ATI(0): Backing store disabled (==) ATI(0): Silken mouse enabled (II) ATI(0): Direct rendering disabled (==) RandR enabled I also tried using EXA instead of XAA and setting: Option "AccelMethod" "XAA" Option "XAANoOffscreenPixmaps" "true" uname -a Linux sir5.erg.inpe.br 2.6.18-128.7.1.el5 #1 SMP Mon Aug 24 08:20:55 EDT 2009 i686 i686 i386 GNU/Linux rpm -qa | grep xorg-x11-server xorg-x11-server-utils-7.1-4.fc6 xorg-x11-server-sdk-1.1.1-48.52.el5 xorg-x11-server-Xvfb-1.1.1-48.52.el5 xorg-x11-server-Xnest-1.1.1-48.52.el5 xorg-x11-server-Xorg-1.1.1-48.52.el5 The drmOpenDevice error continues when using the suggested Option "AIGLX" "true".

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  • LDAP change user pass on client

    - by Sean
    I am trying to allow ldap users to change their password on client machines. I have tried pam every which way I can think of /etc/ldap.conf & /etc/pam_ldap.conf, as well. At this point I'm stuck. Client: Ubuntu 11.04 Server: Debian 6.0 The current output is this: sobrien4@T-E700F-1:~$ passwd passwd: Authentication service cannot retrieve authentication info passwd: password unchanged /var/log/auth.log gives this during the command: May 9 10:49:06 T-E700F-1 passwd[18515]: pam_unix(passwd:chauthtok): user "sobrien4" does not exist in /etc/passwd May 9 10:49:06 T-E700F-1 passwd[18515]: pam_ldap: ldap_simple_bind Can't contact LDAP server May 9 10:49:06 T-E700F-1 passwd[18515]: pam_ldap: reconnecting to LDAP server... May 9 10:49:06 T-E700F-1 passwd[18515]: pam_ldap: ldap_simple_bind Can't contact LDAP server getent passwd |grep sobrien4 (note keeping short since testing with that account, however it outputs all ldap users): sobrien4:Ffm1oHzwnLz0U:10000:12001:Sean O'Brien:/home/sobrien4:/bin/bash getent group shows all ldap groups. /etc/pam.d/common-password (Note this is just the most current, I have tried a lot of different options): password required pam_cracklib.so retry=3 minlen=8 difok=3 password [success=1 default=ignore] pam_unix.so use_authtok md5 password required pam_ldap.so use_authtok password required pam_permit.so Popped open wireshark as well, the server & client are talking. I have the password changing working on the server. I.E. the server that runs slapd, I can log in with the ldap user and change the passwords. I tried copying the working configs from the server initially and no dice. I also tried cloning it, and just changing ip & host, and no go. My guess is that the client is not authorized by ip or hostname to change a pass. Pertaining to the slapd conf, I saw this in a guide and tried it: access to attrs=loginShell,gecos by dn="cn=admin,dc=cengineering,dc=etb" write by self write by * read access to * by dn="cn=admin,dc=cengineering,dc=etb" write by self write by * read So ldap seems to be working okay, just can't change the password.

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  • Nginx + uWSGI on a fresh Ubuntu install - bind error port 80

    - by knuckfubuck
    I know this is a common problem usually having to do with apache or another service already running on port 80 and I have done a lot of searching and running netstat and still have not figured out why I am getting this error. I rebuilt my slice, did a fresh install of Ubuntu 10.04 and setup nginx + uwsgi. It worked and I was able to see my Django site. I then installed Postgres8.4 and the rest of the stack needed for Geodjango from this link. After that was done I tried to restart nginx and I get this error: sudo /etc/init.d/nginx start Starting nginx: the configuration file /usr/local/nginx/conf/nginx.conf syntax is ok configuration file /usr/local/nginx/conf/nginx.conf test is successful [emerg]: bind() to 0.0.0.0:80 failed (98: Address already in use) [emerg]: bind() to 0.0.0.0:80 failed (98: Address already in use) [emerg]: bind() to 0.0.0.0:80 failed (98: Address already in use) [emerg]: bind() to 0.0.0.0:80 failed (98: Address already in use) [emerg]: bind() to 0.0.0.0:80 failed (98: Address already in use) [emerg]: still could not bind() I have nginx set to listen 80. Here's an output from netstat -l --numeric-ports | grep 80: tcp 0 0 0.0.0.0:80 0.0.0.0:* LISTEN tcp 0 0 127.0.0.1:8000 0.0.0.0:* LISTEN Output from sudo lsof +M -i4: nginx 2330 root 8u IPv4 3195 0t0 TCP *:www (LISTEN) nginx 2331 www-data 8u IPv4 3195 0t0 TCP *:www (LISTEN) uwsgi 2335 s 4u IPv4 3259 0t0 TCP localhost:8000 (LISTEN) uwsgi 2352 s 4u IPv4 3259 0t0 TCP localhost:8000 (LISTEN) uwsgi 2353 s 4u IPv4 3259 0t0 TCP localhost:8000 (LISTEN) uwsgi 2354 s 4u IPv4 3259 0t0 TCP localhost:8000 (LISTEN) uwsgi 2355 s 4u IPv4 3259 0t0 TCP localhost:8000 (LISTEN) Anyone have any other ideas how I can figure out what is blocking port 80? edit Paste of my /etc/init.d/nginx script here: http://dpaste.com/hold/400937/

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  • How to remotely open gedit with SFTP URL in Gnome through SSH?

    - by Álvaro Justen
    My setup is weird and I can't change it now. I have two machines: local-machine: it's my desktop running Ubuntu with Gnome remote-machine: it's one virtual machine, also running Ubuntu but without X In both machines I have my private and public SSH keys. I need to run SSH from remote-machine to local-machine and run gedit (in local-machine, under the default $DISPLAY) but openning a file in remote-machine throught SFTP. Something like this: myuser@remote-machine:~$ ssh local-machine "DISPLAY=:0.0 gedit sftp://remote-machine/some/file" The command above doesn't work. gedit shows this message: Could not open the file sftp://remote-machine/some/file. gedit cannot handle sftp: locations. Note that: /some/file exists on remote-machine. I can SSH normally from remote-machine to local-machine using my SSH key without any problems! I can run the command DISPLAY=:0.0 gedit sftp://remote-machine/some/file in a terminal on local-machine and gedit opens the file on remote-machine without any problems - but the terminal in which I executed the command is running in DISPLAY :0 (really, it's gnome-terminal). I also tried -t option of SSH client (to force pseudo-tty allocation) but it didn't work. If I try to run DISPLAY=:0.0 gedit sftp://remote-machine/some/file in local-machine but under a tty (for example in tty1, by pressing <Ctrl>+<Alt>+<F1>) it doesn't not work - I get the same error when running from remote-machine. I found that if I pass the environment variable DBUS_SESSION_BUS_ADDRESS with a correct value, it works! So, if I do something like that: myuser@local-machine:~$ env | grep DBUS_SESSION_BUS_ADDRESS > env.txt myuser@local-machine:~$ scp env.txt remote-machine: and then: myuser@remote-machine:~$ ssh local-machine "DISPLAY=:0.0 $(cat env.txt) gedit sftp://remote-machine/some/file" it works! The problem is that I'm not on local-machine so I can't get the correct value for this env variable. Is there any other way to make this work?

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  • kvm works only when kvm-intel is unloaded

    - by Sathya
    I am new to kvm. I have this strange issue. But before explaining the issue, here is my set up. I try to install VM on my Host which is a Acer Laptop 5720 Has T7500 Intel processor. The cpu flags indicate that Virtualization is supported. I run Ubuntu 10.04 (lucid) on it. It comes with kvm. Now coming to the issue - I dont get any errors while executing "sudo modprobe kvm-intel". So I presume my processor does indeed support hardware virtualization. I use virt-manager and create a VM on which I install ubuntu from an *.iso file. When I start the VM it says it is running. No signs of any trouble. I can see the domain list in "virsh list". But when I try to connect to the VM thru VNC, all I get to see is a blank screen (no cursor). There is no response to any key press. I changed the video mode etc. Tried all different combinations but none work. But strangely, if I shutdown the vm an virt-manager and then unload the module by doing "sudo modprove -r kvm-intel", everything works fine. ie., I can see the screen via VNC. I am able to install the OS and so on. So what does this mean ? IS hardware virtualization not supported ? How come there is no error anywhere ? dmesg | grep kvm doesnt report anything. Can someone throw light on what excatly is happening ?

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  • What's up with stat on MacOSX/Darwin? Or filesystems without names...

    - by Charles Stewart
    In response to a question I asked on SO, Give the mount point of a path, one respondant suggested using stat to get the device name associated with the volume of a given path. This works nicely on Linux, but gives crazy results on MacOSX 10.4. For my system, df and mount give: cas cas$ df Filesystem 512-blocks Used Avail Capacity Mounted on /dev/disk0s3 58342896 49924456 7906440 86% / devfs 194 194 0 100% /dev fdesc 2 2 0 100% /dev <volfs> 1024 1024 0 100% /.vol automount -nsl [166] 0 0 0 100% /Network automount -fstab [170] 0 0 0 100% /automount/Servers automount -static [170] 0 0 0 100% /automount/static /dev/disk2s1 163577856 23225520 140352336 14% /Volumes/Snapshot /dev/disk2s2 409404102 5745938 383187960 1% /Volumes/Sparse cas cas$ mount /dev/disk0s3 on / (local, journaled) devfs on /dev (local) fdesc on /dev (union) <volfs> on /.vol automount -nsl [166] on /Network (automounted) automount -fstab [170] on /automount/Servers (automounted) automount -static [170] on /automount/static (automounted) /dev/disk2s1 on /Volumes/Snapshot (local, nodev, nosuid, journaled) /dev/disk2s2 on /Volumes/Sparse (asynchronous, local, nodev, nosuid) Trying to get the devices from the mount points, though: cas cas$ df | grep -e/ | awk '{print $NF}' | while read line; do echo $line $(stat -f"%Sdr" $line); done / disk0s3r /dev ???r /dev ???r /.vol ???r /Network ???r /automount/Servers ???r /automount/static ???r /Volumes/Snapshot disk2s1r /Volumes/Sparse disk2s2r Here, I'm feeding each of the mount points scraped from df to stat, outputting the results of the "%Sdr" format string, which is supposed to be the device name: Cf. stat(1) man page: The special output specifier S may be used to indicate that the output, if applicable, should be in string format. May be used in combination with: ... dr Display actual device name. What's going on? Is it a bug in stat, or some Darwin VFS weirdness? Postscript Per Andrew McGregor, try passing "%Sd" to stat for more weirdness. It lists some apparently arbitrary subset of files from CWD...

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  • Ubuntu: package installed, but files missing?

    - by jeckyll2hide
    I have been playing around with the /etc/asterisk directory, installing the related pacakge (asterisk-config), removing it, removing the directory manually (just playing around to get the configuration synced to my configuration repo). Now I just want to reinstall the official package, so I do: root@tethys:/etc# apt-get install asterisk-config root@tethys:/etc# tree asterisk/ asterisk/ +-- manager.d What?! Empty?!? Have I installed it? root@tethys:/etc# dpkg --get-selections | grep asterisk asterisk install asterisk-config install asterisk-core-sounds-en install asterisk-core-sounds-en-gsm install asterisk-modules install asterisk-moh-opsound-gsm install asterisk-voicemail install Indeed! Let me check the contents of the package: root@tethys:/etc# dpkg -L asterisk-config ... /etc /etc/asterisk /etc/asterisk/res_snmp.conf /etc/asterisk/dbsep.conf /etc/asterisk/cel_custom.conf /etc/asterisk/cel.conf /etc/asterisk/meetme.conf /etc/asterisk/jingle.conf /etc/asterisk/queuerules.conf ... So, what have I done that the package will get installed, but the contents are nowhere to be seen? And, more importantly, how can I force the contents to be installed, no matter what I have done before?

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  • r1soft agent is failing with the error: "write error while sending code: Broken pipe"

    - by curiousguy
    I have an Ubuntu 10.04.4 LTS server with r1soft agent installed in it. Recently, the backups are failing with the following error. -------- write error while sending code: Broken pipe -------- I have reinstalled the buagent but to no avail. On checking the server logs, I could see the following errors listed in it: -------- # tail -f /var/log/messages |grep -i buagent Nov 17 03:35:06 microscope buagent: Need to back up 126 sectors Nov 17 03:35:06 microscope buagent: (Righteous Backup Linux Agent) 1.79.0 build 12433 Nov 17 03:35:06 microscope buagent: allowing control from backup server (10.128.136.195) with valid RSA key Nov 17 03:35:06 microscope buagent: allowing control from backup server (10.128.136.201) with valid RSA key Nov 17 03:35:06 microscope buagent: sending auth challenge for allowed host at (10.128.136.201) port (47890) Nov 17 03:35:06 microscope buagent: host (10.128.136.201) port (47890) authentication successful Nov 17 03:35:06 microscope buagent: Backup request accepted. Starting backup. Nov 17 03:35:06 microscope buagent: Snapshot completed in 0.010 seconds. Nov 17 03:45:03 microscope buagent: Error reading blocks from snapshot. Nov 17 03:45:03 microscope buagent: Reading blocks failed Nov 17 03:45:03 microscope buagent: error backup aborted Nov 17 03:45:03 microscope buagent: backup failed on agent closing connection Nov 17 03:45:03 microscope buagent: Backup failed. Nov 17 03:45:03 microscope buagent: write error while sending code: Broken pipe (32) Nov 17 03:45:03 microscope buagent: tell child write failed -------- I tried changing the 'Timeout' and 'DiskAsPartition' value in '/etc/buagent/agent_config' file but no luck. Also, verified that proper route is added to the backup server. The agent is also running fine. Am I missing anything? Any help would be much appreciated. Note: CDP 2.0 is installed in the backup server.

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  • FreeBSD Traffic Shaping

    - by alexus
    Hi I'm trying to do traffic shaping with FreeBSD, here are my rules su-3.2# ipfw show | grep pipe 08380 1514852 125523804 pipe 1 tcp from any to any dst-port 80 su-3.2# ipfw pipe 1 show 00001: 2.000 Mbit/s 0 ms 50 sl. 1 queues (1 buckets) droptail mask: 0x00 0x00000000/0x0000 - 0x00000000/0x0000 BKT Prot ___Source IP/port____ ____Dest. IP/port____ Tot_pkt/bytes Pkt/Byte Drp 0 tcp 64.237.55.83/60598 72.21.81.133/80 6520267 1204533020 0 0 1216 su-3.2# first of all why when I run ipfw pipe 1 show i get same source and destination ip, that doesnt seem like ever change yet total packets/bytes increasing and most important question, after donig all that I'm looking at my MRTG stats and I see i'm very well over 2Mbit/s limit. what am I doing wrong? here is config file flush pipe flush pipe 1 config bw 2Mbit/s add 100 allow ip from any to any via lo0 add 200 deny ip from any to 127.0.0.0/8 add 300 deny ip from 127.0.0.0/8 to any add 8380 pipe 1 tcp from any to any src-port www uid daemon add 8380 pipe 1 tcp from any to any dst-port www uid daemon add 65000 pass all from any to any

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  • switchless Infiniband between two servers on RHEL 6.3

    - by exfizik
    I have 2 servers running RHEL 6.3 which have 2 port Infiniband cards >lspci | grep -i infini 07:00.0 InfiniBand: QLogic Corp. IBA7322 QDR InfiniBand HCA (rev 02) I'm interested in connecting them directly to each other bypassing an Infiniband switch (which I don't have). Quick googling showed that at least in some configurations it's possible. I installed all RedHat Infiniband packages with yum groupinstall "Infiniband Support". However, ibv_devinfo shows that both ports in each card are down, which indicates that cables are not connected. But the cable is connected, although the LEDs are off on the cards (not a good sign). Another source of confusion for me is that according to this, RedHat doesn't come with OFED packages and I'm slightly hesitant to install them from source due to the lack of RedHat support for them... So where am I going with this? The questions I have are: is it possible to have a switchless/direct Infiniband connection between two servers the way I described above? If it's possible, do I have to use the OFED packages or can I configure everything with just the packages coming with RHEL. Why are the LEDs off on my servers even though the cable is connected? Any additional input/advice/pointers would be appreciated. P.S. I followed this guide for installation instructions. The Infiniband cards are clearly recognized by my OS and the rdma service is running. Update: I have opensm installed. When I run it it says: OpenSM 3.3.13 Command Line Arguments: Log File: /var/log/opensm.log ------------------------------------------------- OpenSM 3.3.13 Entering DISCOVERING state Using default GUID 0x1175000076e4c8 SM port is down and stays at that point.

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  • Is there a tool that can test what SSL/TLS cipher suites a particular website offers?

    - by Jeremy Powell
    Is there a tool that can test what SSL/TLS cipher suites a particular website offers? I've tried openssl, but if you examine the output: $ echo -n | openssl s_client -connect www.google.com:443 CONNECTED(00000003) depth=1 /C=ZA/O=Thawte Consulting (Pty) Ltd./CN=Thawte SGC CA verify error:num=20:unable to get local issuer certificate verify return:0 --- Certificate chain 0 s:/C=US/ST=California/L=Mountain View/O=Google Inc/CN=www.google.com i:/C=ZA/O=Thawte Consulting (Pty) Ltd./CN=Thawte SGC CA 1 s:/C=ZA/O=Thawte Consulting (Pty) Ltd./CN=Thawte SGC CA i:/C=US/O=VeriSign, Inc./OU=Class 3 Public Primary Certification Authority --- Server certificate -----BEGIN CERTIFICATE----- MIIDITCCAoqgAwIBAgIQL9+89q6RUm0PmqPfQDQ+mjANBgkqhkiG9w0BAQUFADBM MQswCQYDVQQGEwJaQTElMCMGA1UEChMcVGhhd3RlIENvbnN1bHRpbmcgKFB0eSkg THRkLjEWMBQGA1UEAxMNVGhhd3RlIFNHQyBDQTAeFw0wOTEyMTgwMDAwMDBaFw0x MTEyMTgyMzU5NTlaMGgxCzAJBgNVBAYTAlVTMRMwEQYDVQQIEwpDYWxpZm9ybmlh MRYwFAYDVQQHFA1Nb3VudGFpbiBWaWV3MRMwEQYDVQQKFApHb29nbGUgSW5jMRcw FQYDVQQDFA53d3cuZ29vZ2xlLmNvbTCBnzANBgkqhkiG9w0BAQEFAAOBjQAwgYkC gYEA6PmGD5D6htffvXImttdEAoN4c9kCKO+IRTn7EOh8rqk41XXGOOsKFQebg+jN gtXj9xVoRaELGYW84u+E593y17iYwqG7tcFR39SDAqc9BkJb4SLD3muFXxzW2k6L 05vuuWciKh0R73mkszeK9P4Y/bz5RiNQl/Os/CRGK1w7t0UCAwEAAaOB5zCB5DAM BgNVHRMBAf8EAjAAMDYGA1UdHwQvMC0wK6ApoCeGJWh0dHA6Ly9jcmwudGhhd3Rl LmNvbS9UaGF3dGVTR0NDQS5jcmwwKAYDVR0lBCEwHwYIKwYBBQUHAwEGCCsGAQUF BwMCBglghkgBhvhCBAEwcgYIKwYBBQUHAQEEZjBkMCIGCCsGAQUFBzABhhZodHRw Oi8vb2NzcC50aGF3dGUuY29tMD4GCCsGAQUFBzAChjJodHRwOi8vd3d3LnRoYXd0 ZS5jb20vcmVwb3NpdG9yeS9UaGF3dGVfU0dDX0NBLmNydDANBgkqhkiG9w0BAQUF AAOBgQCfQ89bxFApsb/isJr/aiEdLRLDLE5a+RLizrmCUi3nHX4adpaQedEkUjh5 u2ONgJd8IyAPkU0Wueru9G2Jysa9zCRo1kNbzipYvzwY4OA8Ys+WAi0oR1A04Se6 z5nRUP8pJcA2NhUzUnC+MY+f6H/nEQyNv4SgQhqAibAxWEEHXw== -----END CERTIFICATE----- subject=/C=US/ST=California/L=Mountain View/O=Google Inc/CN=www.google.com issuer=/C=ZA/O=Thawte Consulting (Pty) Ltd./CN=Thawte SGC CA --- No client certificate CA names sent --- SSL handshake has read 1777 bytes and written 316 bytes --- New, TLSv1/SSLv3, Cipher is AES256-SHA Server public key is 1024 bit Compression: NONE Expansion: NONE SSL-Session: Protocol : TLSv1 Cipher : AES256-SHA Session-ID: 748E2B5FEFF9EA065DA2F04A06FBF456502F3E64DF1B4FF054F54817C473270C Session-ID-ctx: Master-Key: C4284AE7D76421F782A822B3780FA9677A726A25E1258160CA30D346D65C5F4049DA3D10A41F3FA4816DD9606197FAE5 Key-Arg : None Start Time: 1266259321 Timeout : 300 (sec) Verify return code: 20 (unable to get local issuer certificate) --- it just shows that the cipher suite is something with AES256-SHA. I know I could grep through the hex dump of the conversation, but I was hoping for something a little more elegant. I would prefer Linux tools, but Windows (or other) would be fine. This question is motivated by the security testing I do for PCI and general penetration testing. Update: GregS points out below that the SSL server picks from the cipher suites of the client. So it seems I would need to test all cipher suites one at a time. I think I can hack something together, but is there a tool that does particularly this?

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  • mysql startup, shtudown and logging on osx

    - by Joelio
    Hi, I am trying to troubleshoot some mysql problems (I have a table I cant seem to delete or drop, it hangs forever) I have 10.5.8 osx, I dont remember how/if I installed mysql, here is what I know: it automatically starts on boot the process looks like this: /usr/local/mysql/libexec/mysqld --basedir=/usr/local/mysql --datadir=/usr/local/mysql/var --pid-file=/usr/local/mysql/var/Joels-New-Pro.local.pid _mysql 96 0.0 0.0 75884 684 ?? Ss Sat06PM 0:00.02 /bin/sh /usr/local/mysql/bin/mysqld_safe when I run: /usr/local/mysql/libexec/mysqld --verbose --help it says: /usr/local/mysql/libexec/mysqld Ver 5.0.45 for apple-darwin9.1.0 on i686 (Source distribution) it seems to use my.cnf from /etc/my.cnf Now here are my questions: I dont see anything in the startupitems that remotely looks like mysql ls /Library/StartupItems/ BRESINKx86Monitoring ChmodBPF HP IO HP Trap Monitor Parallels ParallelsTransporter 1.) So how does it startup automatically? 2.) How do I start & stop this type of installation? Also, looking at the config, the logs have no values: /usr/local/mysql/libexec/mysqld --verbose --help|grep '^log' log (No default value) log-bin (No default value) log-bin-index (No default value) log-bin-trust-function-creators FALSE log-bin-trust-routine-creators FALSE log-error log-isam myisam.log log-queries-not-using-indexes FALSE log-short-format FALSE log-slave-updates FALSE log-slow-admin-statements FALSE log-slow-queries (No default value) log-tc tc.log log-tc-size 24576 log-update (No default value) log-warnings 1 3.) Does that mean there is no logging enabled in mysetup? thanks in advance! Joel

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  • Mounting Replicated Gluster Multi-AZ Storage

    - by Roman Newaza
    I have Replicated Gluster Storage which is used by Auto scaling Servers. Both, Auto scaling and Storage are allocated in two Availability zones. Gluster: Number of Bricks: 4 x 2 = 8 Transport-type: tcp Bricks: Brick1: gluster01:/storage/1a # Zone A Brick2: gluster02:/storage/1b # Zone B Brick3: gluster03:/storage/2a # Zone A Brick4: gluster04:/storage/2b # Zone B Brick5: gluster01:/storage/3a # Zone A Brick6: gluster02:/storage/3b # Zone B Brick7: gluster03:/storage/4a # Zone A Brick8: gluster04:/storage/4b # Zone B I used Round Robin DNS for Gluster entry point, so DNS name resolves to all of the storage server addresses which are returned in different order all the time: # host storage.domain.com storage.domain.com has address xx.xx.xx.x1 storage.domain.com has address xx.xx.xx.x2 storage.domain.com has address xx.xx.xx.x3 storage.domain.com has address xx.xx.xx.x4 The Storage is mounted with Native Gluster Client: # grep storage /etc/fstab storage.domain.com:/storage /storage glusterfs defaults,log-level=WARNING,log-file=/var/log/gluster.log 0 0 I have heard Gluster might be mounted with the first Server IP and after that it will fetch its configuration with the rest of Servers. Personally, I never tested single Server mount setup and I don't know how Gluster handles this. On EC2, traffic among single Availability zone is free and between different zones is not. When Client in zone A writes to storage and IP of Storage in zone B is returned, it will cost me twice more for data transfer: Client (Zone A) - Storage Server (Zone B) - Replication to Storage Server (Zone A). Question: Would it be better to mount Storage Server of the same zone, so that data transfer charges apply only for replication (A - A - B)?

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  • mcelog doesn't fails to start PUIAS 6.4 amd hardware

    - by Predrag Punosevac
    Folks, I am a total Linux n00b. I am trying to deploy mcelog on one of my computing nodes running PUIAS 6.4 (i86_64) [root@lov3 edac]# uname -a Linux lov3.mylab.org 2.6.32-358.18.1.el6.x86_64 #1 SMP Tue Aug 27 22:40:32 EDT 2013 x86_64 x86_64 x86_64 GNU/Linux a free clone of Red Hat 6.4 on AMD hardware [root@lov3 mcelog]# lscpu Architecture: x86_64 CPU op-mode(s): 32-bit, 64-bit Byte Order: Little Endian CPU(s): 64 On-line CPU(s) list: 0-63 Thread(s) per core: 2 Core(s) per socket: 8 Socket(s): 4 NUMA node(s): 8 Vendor ID: AuthenticAMD CPU family: 21 Model: 2 Stepping: 0 CPU MHz: 1400.000 BogoMIPS: 4999.30 Virtualization: AMD-V L1d cache: 16K L1i cache: 64K L2 cache: 2048K L3 cache: 6144K NUMA node0 CPU(s): 0-7 NUMA node1 CPU(s): 8-15 NUMA node2 CPU(s): 16-23 NUMA node3 CPU(s): 24-31 NUMA node4 CPU(s): 32-39 NUMA node5 CPU(s): 40-47 NUMA node6 CPU(s): 48-55 NUMA node7 CPU(s): 56-63 My mcelog.conf file is more or less default apart of the fact that I would like to run mcelog as a daemon and to log errors. When I start mcelog [root@lov3 mcelog]# mcelog --config-file mcelog.conf AMD Processor family 21: Please load edac_mce_amd module. However the module is present [root@lov3 mcelog]# locate edac_mce_amd.ko /lib/modules/2.6.32-358.18.1.el6.x86_64/kernel/drivers/edac/edac_mce_amd.ko /lib/modules/2.6.32-358.el6.x86_64/kernel/drivers/edac/edac_mce_amd.ko and loaded [root@lov3 edac]# lsmod | grep mce edac_mce_amd 14705 1 amd64_edac_mod Is there anything that I can do to get mcelog working? The only reference I found is this thread http://lists.centos.org/pipermail/centos/2012-November/130226.html

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  • executable in path, findable by which, yet cannot execute without fully qualifying path?

    - by Peeter Joot
    I've got a bizarre seeming shell issue, with a command in the $PATH that the shell (ksh, running on Linux) appears to cowardly refuse to invoke. Without fully qualifying the command, I get: # mycommand /bin/ksh: mycommand: not found [No such file or directory] but the file can be found by which: # which mycommand /home/me/admbin/mycommand I also explicitly see that directory in $PATH: # echo $PATH | tr : '\n' | grep adm /home/me/admbin The exe at that location seems normal: # file /home/me/admbin/mycommand /home/me/admbin/mycommand: setuid setgid ELF 64-bit LSB executable, x86-64, version 1 (SYSV), for GNU/Linux 2.6.4, dynamically linked (uses shared libs), not stripped # ls -l mycommand -r-sr-s--- 1 me mygroup 97892 2012-04-11 18:01 mycommand and if I run it explicitly using a fully qualified path: # /home/me/admbin/mycommand I see the expected output. Something is definitely confusing the shell here, but I'm at a loss what it could be? EDIT: finding what looked like a similar question: Binary won't execute when run with a path. Eg >./program won't work but >program works fine I also tested for more than one such command in my $PATH, but find only one: # for i in `echo $PATH | tr : '\n'` ; do test -e $i/mycommand && echo $i/mycommand ; done /home/me/admbin/mycommand

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  • configuring vsftpd anonymous upload. Creates files but freezes at 0 bytes

    - by Wayne
    vsftpd on ubuntu after sudo apt-get install vsftpd Then did configuration as in the attached /etc/vsftpd.conf file. Anonymous ftp allows cd to the upload directly and allows put myfile.txt which gets created on the server but then the client hangs and never proceeds. The file on the server remains at 0 bytes. Here's the folders and permissions: root@support:/home/ftp# ls -ld . drwxr-xr-x 3 root root 4096 Jun 22 00:00 . root@support:/home/ftp# ls -ld pub drwxr-xr-x 3 root root 4096 Jun 21 23:59 pub root@support:/home/ftp# ls -ld pub/upload drwxr-xr-x 2 ftp ftp 4096 Jun 22 00:06 pub/upload root@support:/home/ftp# Here's the vsftpd.conf file: root@support:/home/ftp# grep -v '#' /etc/vsftpd.conf listen=YES anonymous_enable=YES write_enable=YES anon_upload_enable=YES dirmessage_enable=YES xferlog_enable=YES anon_root=/home/ftp/pub/ connect_from_port_20=YES chown_uploads=YES chown_username=ftp nopriv_user=ftp secure_chroot_dir=/var/run/vsftpd pam_service_name=vsftpd rsa_cert_file=/etc/ssl/certs/ssl-cert-snakeoil.pem rsa_private_key_file=/etc/ssl/private/ssl-cert-snakeoil.key Here's a file example that attempted to upload: root@support:/home/ftp/pub/upload# ls -l total 0 -rw------- 1 ftp nogroup 0 Jun 22 00:06 build.out This is the client attempting to upload...it is frozen at this point: $ ftp 173.203.89.78 Connected to 173.203.89.78. 220 (vsFTPd 2.0.6) User (173.203.89.78:(none)): ftp 331 Please specify the password. Password: 230 Login successful. ftp> put build.out 200 PORT command successful. Consider using PASV. 553 Could not create file. ftp> cd upload 250 Directory successfully changed. ftp> put build.out 200 PORT command successful. Consider using PASV. 150 Ok to send data.

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  • Authenticate users with Zimbra LDAP Server from other CentOS clients

    - by efesaid
    I'am wondering that how can integrate my database,web,backup etc.. centos servers with Zimbra LDAP Server. Does it require more advanced configuration than standart ldap authentication ? My zimbra server version is [zimbra@zimbra ~]$ zmcontrol -v Release 8.0.5_GA_5839.RHEL6_64_20130910123908 RHEL6_64 FOSS edition. My LDAP Server status is [zimbra@ldap ~]$ zmcontrol status Host ldap.domain.com ldap Running snmp Running stats Running zmconfigd Running I already installed nss-pam-ldapd packages to my servers. [root@www]# rpm -qa | grep ldap nss-pam-ldapd-0.7.5-18.2.el6_4.x86_64 apr-util-ldap-1.3.9-3.el6_0.1.x86_64 pam_ldap-185-11.el6.x86_64 openldap-2.4.23-32.el6_4.1.x86_64 My /etc/nslcd.conf is [root@www]# tail -n 7 /etc/nslcd.conf uid nslcd gid ldap # This comment prevents repeated auto-migration of settings. uri ldap://ldap.domain.com base dc=domain,dc=com binddn uid=zimbra,cn=admins,cn=zimbra bindpw **pass** ssl no tls_cacertdir /etc/openldap/cacerts When i run [root@www ~]# id username id: username: No such user But i am sure that username user exist on ldap server. EDIT : When i run ldapsearch command i got all result with credentials and dn. [root@www ~]# ldapsearch -H ldap://ldap.domain.com:389 -w **pass** -D uid=zimbra,cn=admins,cn=zimbra -x 'objectclass=*' # extended LDIF # # LDAPv3 # base <dc=domain,dc=com> (default) with scope subtree # filter: objectclass=* # requesting: ALL # # domain.com dn: dc=domain,dc=com zimbraDomainType: local zimbraDomainStatus: active . . .

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