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• Remote Sending of Emails via SMTP/EXIM Issue

  - by Christian Noel

  I have been encountering a problem when sending messages via EXIM. Here is the scenario: I have 2 servers lets just say host1.com = where all my apps and programs are hosted. host2.com = is another server which handles some apps but is also my smtp mail server. whm and cpanel are installed in both hosts as well as exim. right now, messages are being sent out as [email protected] to clients. host1.com uses the [email protected] so that it can send messages outbound as well. here's the problem, after a few hours from a fresh reboot of host1.com, sending messages from host1.com is no longer possible because i encounter an error that states: system/vendor/swift/Swift/Connection/SMTP.php [309]: The SMTP connection failed to start [tls://mail.host2.com]: fsockopen returned Error Number 110 and Error String 'Connection timed out'` also note that this was working fine earlier (like 10 hours ago) but then it suddenly fails. everytime i restart the host1.com then sending messages will work again. i have checked logs and traces but to no avail the only means of fixing this problem is restarting host1.com.

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• opennebula VM submission failure

  - by user61175

  I am new to OpenNebula, the cloud is up and running but the VM is failed to be submitted to a node. I got the following error from the log file. ERROR: Command "scp ubuntu:/opt/nebula/images/ttylinux.img node01:/var/lib/one/8/images/disk.0" failed. ERROR: Host key verification failed. Error excuting image transfer script: Host key verification failed. The key verification keeps failing. I need to know what is going wrong ... thanks :)

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• Xen dom0 reports incorrect amount of RAM with dom0_mem set

  - by xen_amnesiac

  I've done a fair bit of searching about this, but have found nothing that answers my question. I have a system with 6GB of RAM which acts as a Xen server. For reference, it runs Ubuntu 12.04. I've set the kernel parameter dom0_mem:512M,max:512M in /etc/default/grub as follows: GRUB_CMDLINE_XEN_DEFAULT="dom0_mem=min:512M,max:512M" I've tried variations of that, with the same result. My question is this: With the above set, the dom0 reports in all applications a RAM amount of 422M. cat /proc/meminfo gives the following: $ cat /proc/meminfo MemTotal: 432472 kB MemFree: 54144 kB Buffers: 17640 kB Cached: 220104 kB SwapCached: 30172 kB Active: 136500 kB Inactive: 167780 kB Active(anon): 6156 kB Inactive(anon): 60516 kB Active(file): 130344 kB Inactive(file): 107264 kB Unevictable: 52 kB Mlocked: 52 kB SwapTotal: 1794044 kB SwapFree: 1682012 kB Dirty: 0 kB Writeback: 0 kB AnonPages: 39572 kB Mapped: 8048 kB Shmem: 136 kB Slab: 44324 kB SReclaimable: 22012 kB SUnreclaim: 22312 kB KernelStack: 1280 kB PageTables: 3840 kB NFS_Unstable: 0 kB Bounce: 0 kB WritebackTmp: 0 kB CommitLimit: 2010280 kB Committed_AS: 329192 kB VmallocTotal: 34359738367 kB VmallocUsed: 313988 kB VmallocChunk: 34359417340 kB HardwareCorrupted: 0 kB AnonHugePages: 0 kB HugePages_Total: 0 HugePages_Free: 0 HugePages_Rsvd: 0 HugePages_Surp: 0 Hugepagesize: 2048 kB DirectMap4k: 524696 kB DirectMap2M: 0 kB top, htop, free -m, and byobu's RAM monitor all report the same amount. At first I thought this was because of the onboard graphics borrowing some memory, but have now switched to a dedicated GPU and it persists. Is this normal behavior, or has something gone amiss? It's just about 100MB of RAM that's "gone", and I have no idea where it went. I understand that it's normal that not all RAM is available for allocation, but does the system really take an amount relatively high to the amount of RAM available?

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• Run script before shutdown/restart

  - by dtbarne

  I'd like to run a PHP script when an instance is told to shutdown, but of course before it actually finishes shutting down. My particular script is just looking to push some log files from the local partition to a another server. I've got the gist of how this process works, but I need some clarification. How I understand it. Please correct me if I'm wrong. Create an executable script in /etc/init.d (lets call it /etc/init.d/push-logs) Create a symlink to /etc/init.d/push-logs from /etc/rc0.d (shutdown) and /etc/rc6.d (reboot). The name should be KXXpush-logs Here's my questions: Of course - am I understanding correctly? For #2 above - it sounds like the lower the XX the better - is there too low a number I can use? Does it matter if it shares a number with another script? Does the script in /etc/init.d/push-logs HAVE to follow the standard init.d template (supporting start/stop, etc. commands)? This doesn't really apply to my use case. If possible I just want the script to be the following: #!/bin/sh # # Run PHP file prior to shutdown # /usr/bin/php /path/to/php_file.php

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• Using an allowed user list with VSFTPD

  - by Naftuli Tzvi Kay

  According to the Wiki here, you can only allow certain users to log in over FTP using the following configuration in your /etc/vsftp.conf file: userlist_enable=YES userlist_file=/etc/vsftp.user_list userlist_deny=NO I've configured my system to use this configuration, and I only have one user which I'd like to expose over FTP named streams, so my /etc/vsftp.user_list looks like this: streams Interestingly enough, I cannot log in once I enable to user list. If I change userlist_enable to NO, then things work properly, but if I enable it, I can't log in all, it just keeps trying to reconnect. I don't get a login failed message, it just keeps trying to reconnect when using lftp. My /etc/vsftp.conf file is available on Pastebin here and my /etc/vsftp.user_list is available here. What am I doing wrong here? I'd just like to only make the streams user able to log in.

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• Correct way to treat iptables init failure?

  - by chris_l

  Hi, I'm initializing my iptables rules via /etc/network/if-pre-up.d/iptables, using iptables-restore. This works fine, but I'm a bit worried about what would happen, if that script failed for some reason (maybe the saved iptables file is corrupt or whatever). In case the script failed, I'd like to: Start up my network interfaces without any iptables rules Start up OpenSSH server But not any other services like web server, ... (and maybe stop running instances) Is there a good canonical way to do that? Going into a lower init stage? - I haven't done that in a long time, and I think a lot about init has changed in recent years (?) - which stage should I drop to, and would the OpenSSH server and my network interfaces still run? Thanks Chris (On Debian Lenny)

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• sequential SSH command execution not working in Ubuntu/Bash

  - by kumar

  My requirement is I will have a set of commands that needs to be executed in a text file. My Shell script has to read each command, execute and store the results in a separate file. Here is the snippet which does the above requirement. while read command do echo 'Command :' $command >> "$OUTPUT_FILE" redirect_pos=`expr index "$command" '>>'` if [ `expr index "$command" '>>'` != 0 ];then redirect_fn "$redirect_pos" "$command"; else $command state=$? if [ $state != 0 ];then echo "command failed." >> "$OUTPUT_FILE" else echo "executed successfully." >> "$OUTPUT_FILE" fi fi echo >> "$OUTPUT_FILE" done < "$INPUT_FILE" Sample Commands.txt will be like this ... tar -rvf /var/tmp/logs.tar -C /var/tmp/ Commands_log.txt gzip /var/tmp/logs.tar rm -f /var/tmp/list.txt This is working fine for commands which needs to be executed in local machine. But When I am trying to execute the following ssh commands only the 1st command getting executed. Here are the some of the ssh commands added in my text file. ssh uname@hostname1 tar -rvf /var/tmp/logs.tar -C /var/tmp/ Commands_log.txt ssh uname@hostname2 gzip /var/tmp/logs.tar ssh .. etc When I am executing this in cli it is working fine. Could anybody help me in this?

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• check if my ethernet controller supports gigabit Ethernet

  - by Infestor

  is there a command that i can issue in ubuntu to see explicitly if my ethernet controller supports gigabit ethernet?

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• do i need a dns server?

  - by ajsie

  i have set up a website (lamp) in a vps from a hosting company. im wondering, in what circumstances would i want to set up a dns server on my vps? cause from what i have learned basically a dns just converts domain names into ip addresses. and at the moment my domain provider is doing this in their dns. so in what situations do i benefit from setting up an own dns server?

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• Storage subsystem borking after server restart (all on a Parallel SCSI bus)

  - by Dat Chu

  I have a server (with a SCSI HBA) connected to two Promise VTrak M310p RAID enclosure on the same bus. Everything is working fine until I have to restart my server. Once restarted, the server can no longer communicate with the enclosures: lots of read errors and bus resets. I have to turn off both enclosure, then turn off the server, then turn on the enclosure, then turn on the server for things to work. I don't believe this is the normal behavior, what could I be missing?

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• Getting more helpful tab completion prompts in bash?

  - by Rory McCann

  Let's say I have a directory with a few files in it like this: $ ls file1 file2 file3 And I want to do some tab completion in bash: $ cat file<tab> file1 file2 file3 I remember seeing someone doing tab completion and the shell bolded the next parts, so in this case, it would bold the 1, 2 and 3 of the filename so it'll look like this: file**1** file**2** file**3** which will tell you what you should type in next. I think this was a feature of zsh, but is there any way to get it in bash?

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• TIME_WAIT connections not being cleaned up after timeout period expires

  - by Mark Dawson

  I am stress testing one of my servers by hitting it with a constant stream of new network connections, the tcp_fin_timeout is set to 60, so if I send a constant stream of something like 100 requests per second, I would expect to see a rolling average of 6000 (60 * 100) connections in a TIME_WAIT state, this is happening, but looking in netstat (using -o) to see the timers, I see connections like: TIME_WAIT timewait (0.00/0/0) where their timeout has expired but the connection is still hanging around, I then eventually run out of connections. Anyone know why these connections don't get cleaned up? If I stop creating new connections they do eventually disappear but while I am constantly creating new connections they don't, seems like the kernel isn't getting chance to clean them up? Is there some other config options I need to set to remove the connections as soon as they have expired? The server is running Ubuntu and my web server is nginx. Also it has iptables with connection tracking, not sure if that would cause these TIME_WAIT connections to live on. Thanks Mark.

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• CSR, SSL and load balancers?

  - by RadiantHex

  Hi folks, do I need to generate a CSR on the load balancer or on the individual servers?

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• multiple php compiler on single apache installation

  - by getmizanur

  elloo, i have some old php scripts which runs on php-5.2.x and the current server has php-5.3.x. to get around this problem,i have got two options one is to downgrade php-5.3.x or install php-5.2.x and php-5.3.x at the same time where php-5.2.x serve cgi script. i have decided go for the second option i have followed this tutorial and i can get most of it working however except execution of shell script which selects php-cgi version. i cannot get apache to execute this script. how do i get apache to execute #!/bin/sh # you can change the PHP version here. version="5.2.6" # php.ini file location, */php-5.2.6/lib equals */php-5.2.6/lib/php.ini. PHPRC=/etc/php/phpfarm/inst/php-${version}/lib/php.ini export PHPRC PHP_FCGI_CHILDREN=3 export PHP_FCGI_CHILDREN PHP_FCGI_MAX_REQUESTS=5000 export PHP_FCGI_MAX_REQUESTS # which php-cgi binary to execute exec /etc/php/phpfarm/inst/php-${version}/bin/php-cgi my apache vhost.conf <VirtualHost *:80> ServerName 526.localhost DocumentRoot /home/getmizanur/public_html/www <Directory "/home/getmizanur/public_html/www"> AddHandler php-cgi .php Action php-cgi /php-fcgi/php-cgi-5.2.6 </Directory> </VirtualHost> can some one tell me what am i doing wrong? thanks in advance. solution: if i did a2dismod php5 then the above configuration worked. when a2enmod php5 had been activated, apache was executing php5.3 instead of php5.2 even after telling apache to execute php5.2 shell script. to solve my problem, i had to change my virtualhost configuration <VirtualHost *:80> ServerName 526.localhost DocumentRoot /home/getmizanur/public_html/www DirectoryIndex index.php <Directory "/home/getmizanur/public_html/www"> AddHandler php-cgi .php Action php-cgi /php-fcgi/php-cgi-5.2.6 <FilesMatch "\.php"> SetHandler php-cgi </FilesMatch> </Directory> </VirtualHost> presto, it started working.

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• v4l - capture and watch at the same time

  - by John Barrett

  Capturing v4l and line-in audio using mencoder works very well, but I would like to record real-time gameplay video from consoles plugged into the video card. I've used xawtv for this (Works quite well, can preview and record in real time), but when I enable any deinterlacing or aspect ration options the video fails to record. I have to record raw and re-encode the video with the appropriate filters later to get something workable. Other things I have tried: tvtime with xvidcap and jack audio capture - xvidcap drops frames and muxing the audio is impossible as it will go out of sync (I have not found muxer options that work to force a correct frame rate) mencoder capture to file, attempt to pipe tail of file to mplayer... mencoder works great, piping the file is far too heavy to attempt gameplay. Soooo, v4l capture and preview simultaneously, recommendations?

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• IP tables gateway

  - by WojonsTech

  I am trying to make an iptables gateway. I ordered 3 dedicated server from my hosting company all with dual nics. One server has been given all the ip addresses and is connected directly to the internet and has its other nic connected to a switch where the other servers are all connected also. I want to setup iptables so for example the ip address 50.0.2.4 comes into my gateway server it fowards all the traffic to a private ip address using the second nic. This way the second nic can do what ever it needs and can respond back also. I also want it setup that if any of the other servers needs to download anything over the inernet it is able to do so and by using the same ip address that is used for its incomming traffic. Lastly I would like to be able to setup dns and other needed networking stuff that i maybe not thinking about.

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• Server high memory usage at same time every day

  - by Sam Parmenter

  Right, we moved one of our main sites onto a new AWS box with plenty of grunt as it would allow us more control that we had before and future proof ourselves. About a month ago we started running into issues with high memory usage at the same time every day. In the morning an export is run to export data to a file which is the FTPed to a local machine for processing. The issues were co-inciding with the rough time of the export but when we didn't run the export one day, the server still ran into the same issues. The export has been run at other times in the day since to monitor memory usage to see if it spikes. The conclusion is that the export is fine and barely touches the sides memory wise. No noticeable change in memory usage. When the issue happens, its effect is to kill mysql and require us to restart the process. We think it might be a mysql memory issue, but might just be that mysql is just the first to feel it. Looking at the logs there is no particular query run before the memory usage hits 90%. When it strikes at about 9:20am, the memory usage spikes from a near constant 25% to 98% and very quickly kills mysql to save itself. It usually takes about 3-4 minutes to die. There are no cron jobs running at that time of the day and we haven't noticed a spike in traffic over the period of the issues. Any help would be massively appreciated! thanks.

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• Writing a script for ash?

  - by rumtscho

  My VPN is behaving funny sometimes, and I have to restart it often. I wanted to write a script which does that for me. It doesn't have to be anything fancy, just a shortcut for the commands I have to type into the terminal. More specifically: it will look at the running processes. If it finds a running vpnc process, it will kill it. Then it will start vpnc. I've written bash scripts of similar complexity, but now I don't have a bash, only an ash. Until now, the only difference I noticed is that there are much less commands available, but then, I don't use it very often. So I have some questions. Is writing ash scripts different than writing bash scripts? Is there something specific to consider when doing it? When the script is ready, how can I deploy it? For bash, I just put the executable file under /usr/lib and run it by typing the file name into the command line, will this work with ash? Are there any special pitfalls to watch out for in the script I want to write? I think that the killing process part may get hairy, if I write something that kills the wrong process, but even then running the script shouldn't break anything permanently, right?

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• How do I surround a line with quotes on bash?

  - by obvio171

  When I run for i in $(find -name '*.ogg'); do echo '$i'; done I don't get one line per file as I expected. Instead, when a file name has a space in it, each word comes out in a separate line, so I can't run commands on the files.

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• Alternatives to native LDAP

  - by Matt

  We've implemented an LDAP to NIS solution and have begun transitioning some systems to native LDAP binding for authentication and automount maps. Unfortunately we have a very mixed environment with more than 20 *nix environments. The setup for each variant is of course unique and has required various workarounds to get full functionality. We're now at the point where we're willing to revisit the solution and possibly migrate toward something like Likewise (http://www.likewise.org), but would like to know what others are using to solve this problem.

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• kmemsize problems in VPS even when there is about 500MB free mem

  - by Amer

  Hello, I have a site hosted on a Plesk VPS with 512MB memory and keep on getting kmemsize in "black zone" QoS errors. The soft limit of kmemsize is 12,288,832 and hard limit is 13,517,715. The definition Virtuozzo gives is: Size of unswappable memory, allocated by the operating system kernel. What's eating up the kmemsize? Is there any way to reconfigure and increase the kmemsize? The servers barely have any load or processing. Thanks for the help...

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• After using lvextend, I can't recover unused space

  - by Cory Gagliardi

  I needed to add more disk space to my CentOS VM, so I added another virtual disk, then used lvextend to add the space to the existing partition. The steps I followed was: echo "- - -" > /sys/class/scsi_host/host0/scan pvcreate /dev/sdb vgextend VolGroup00 /dev/sdb lvextend -l +100%FREE /dev/VolGroup00/LogVol00 resize2fs /dev/VolGroup00/LogVol00 This worked fine. I subsequently filled up the VM, then deleted most of the used disk space. However, the unused disk space was never recovered after I deleted all of the files. This will illustrate what I'm saying better: # df -h Filesystem Size Used Avail Use% Mounted on /dev/mapper/VolGroup00-LogVol00 61G 32G 26G 56% / /dev/sda1 99M 20M 75M 21% /boot tmpfs 1006M 0 1006M 0% /dev/shm # pwd; du -h --max-depth=0 / 5.1G . I cannot figure out how to get the partition to see that only 5.1 GB is used. Any ideas what I'm doing wrong?

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• Apache directory structure with multiple hosted languages.

  - by anomareh

  I just got a new work machine up and running and I'm trying to decide on how to set everything up directory wise. I've done some digging around and really haven't been able to find anything conclusive. I know it's a question with a variety of answers but I'm hoping there's some sort of general guidelines or best practices to go by. With that said, here are a few things specific to my situation. I will be doing actual development and testing on the same machine as the server. It is a single user machine in the sense that I will be the only one working on the machine. There will be multiple hosted languages, specifically PHP and RoR while possibly expanding later. I'd like the setup to translate well to a production environment. With those 3 things in mind there are a couple of things I've had in the back of mind. Seeing as it's a single user machine I haven't been able to decide whether or not I should be working on things out of my home directory or if they should be located outside of it. I'm feeling that outside of a user directory would be better as it would translate better to a production environment, but I'm also not sure if that will come with any permission annoyances or concerns seeing as I'll be working on the same machine. Hosting multiple languages seems like it may be a bit quirky. With PHP I've found you're generally just dumping the project somewhere in the document root where as something like a Rails app you have the entire project and you only want the public directory in the document root. Thanks for any insight, opinion, or just personal preference from experience anyone can offer.

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• MySQL open files limit

  - by Brian

  This question is similar to set open_files_limit, but there was no good answer. I need to increase my table_open_cache, but first I need to increase the open_files_limit. I set the option in /etc/mysql/my.cnf: open-files-limit = 8192 This worked fine in my previous install (Ubuntu 8.04), but now in Ubuntu 10.04, when I start the server up, open_files_limit is reported to be 1710. That seems like a pretty random number for the limit to be clipped to. Anyway, I tried getting around it by adding a line like this in /etc/security/limits.conf: mysql hard nofile 8192 I also tried adding this to the pre-start script in mysql's upstart config (/etc/init/mysql.conf): ulimit -n 8192 Obviously neither of those things worked. So where is the hoop that has been added between Ubuntu 8.04 and 10.04 through which I must jump in order to actually increase the open files limit?

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• Trouble serving vhosts when trying to set up wildcard subdomains with dnsmasq in local development e

  - by Jeremy Kendall

  I'm trying to get wildcard DNS enabled on my laptop using dnsmasq. I realize that this has been asked and answered more than once on this forum, but I can't get the solution to work for me. Steps taken so far: Installed dnsmasq Set address=/example.dev/127.0.0.1 in dnsmasq.conf Set listen-address=127.0.0.1 in dnsmasq.conf Ensured nameserver 127.0.0.1 is in /etc/resolv.conf Set prepend domain-name-servers 127.0.0.1; in /etc/dhcp3/dhclient.conf Created a vhost for example.dev Restarted apache and dnsmasq Note: example.dev is not set in /etc/hosts My vhost for example.dev <VirtualHost *:80> ServerName example.dev DocumentRoot /home/jkendall/public_html/example/public ServerAlias *.example.dev # This should be omitted in the production environment SetEnv APPLICATION_ENV development <Directory /home/jkendall/public_html/example/public> DirectoryIndex index.php AllowOverride All Order allow,deny Allow from all </Directory> </VirtualHost> The setup above will server example.dev locally without any problem. It will also serve test.example.dev, but test.example.dev returns the default apache "It works!" index.html from /var/www rather than my index.php in /home/jkendall/public_html/example/public. The solution in this Server Fault thread suggests that address=/.example.dev/127.0.0.1 would resolve my problem, but when I try to use that solution, restarting dnsmasq results in a failure with the error message dnsmasq: error at line 62 of /etc/dnsmasq.conf For grins, I moved my project over to /var/www/example and modified the vhost appropriately. I got the same result as described above. At this point I'm not sure what other steps I can take to resolve the issue. Thoughts?

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