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• How to interpret output from Linux 'top' command?

  - by Ali

  Following a discussion made HERE about how PHP-FPM consuming memory, I just found a problem in reading the memory in top command. Here is a screenshot of my top just after restarting PHP-FPM. Everything is normal: about 20 PHP-FPM processes, each consuming 5.5MB memory (0.3% of total). Here is the aged server right before restart of PHP-FPM (one day after the previous restart). Here, we still have about 25 PHP-FPM with double memory usage (10MB indicating 0.5% of total). Thus, the total memory used should be 600-700 MB. Then, why 1.6GB memory has been used?

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• Guide for installing Zenoss remote SSH monitoring plugin for Ubuntu

  - by normalocity

  I'm trying out Zenoss. I got it to monitor a test machine via SNMP - that was easy enough. Now I want to add another server that is remote, and I want to use the SSH plugin. I've been using this guide, but it skips a few steps for non-RedHat systems. I'm on Ubuntu. The steps I have down so far are: Install alien Convert the .rpm to a .deb file Use dpkg to install teh .deb file My issue: where to get the .rpm file in the first place?

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• rsync ssh not working in crontab after reboot

  - by kabeer

  I was using a script to perform rsync in sudo crontab. The script does a 2-way rsync (from serverA to serverB and reverse). the rsync uses ssh to connect between servers. After i reboot both the server machines, the rsync is not working in sudo crontab. I also setup a new cronjob and it fails, The error is: rsync error: unexplained error (code 255) at io.c(600) [sender=3.0.6] rsync: connection unexpectedly closed (0 bytes received so far) [receiver] However, when run from terminal, the rync script works as expected without issues. please help. looks like issue with ssh. however, i am able to ssh into either servers withoiut issues.

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• PostgreSQL has no service name on CentOS

  - by Kyle MacFarlane

  I installed PostgreSQL in a pretty standard way on CentOS 5.5: rpm -ivh http://yum.pgrpms.org/reporpms/9.0/pgdg-centos-9.0-2.noarch.rpm yum install postgresql90-server postgresql90-contrib chkconfig postgresql-90 on /etc/init.d/postgresql-90 initdb But for some reason I can't use it with the service command because it has no name, .e.g if I do service --status-all I get back the following: master (pid 3095) is running... (pid 3009) is running... rdisc is stopped Or even just /etc/init.d/postgresql-90 status: (pid 3009) is running... So how can I give it a name so that I don't have to type out the whole init script path each time?

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• How to start/stop service with Apache2 on Ubuntu

  - by user142512

  Using Apache, I'd like to be able to start and stop a service on the same server. Essentially, I'm looking for a way to allow Apache (or some script called by Apache) to call sudo service XXXX start. I realize there are severe security implications with this, and I'm looking to minimize the possible effects. There is only a single service that I need to do this for. I've seen some solutions that involve "hacking" the setuid (C/Perl wrapper), others involved editing the /etc/sudoers file. Is there a better way? many thanks, S.

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• Gotchas for reverse proxy setups

  - by kojiro

  We run multiple web applications, some internal-only, some internal/external. I'm putting together a proposal that we use reverse proxy servers to isolate the origin servers, provide SSL termination and (when possible) provide load balancing. For much of our setup, I'm sure it will work nicely, but we do have a few lesser-known proprietary applications that may need special treatment when we move forward with reverse-proxying. What kinds of traps tend to cause problems when moving an origin server from being on the front lines to being behind a proxy? (For example, I can imagine problems if an application needed to know the IP address of incoming requests.)

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• Patch Management and System Inventory on a Windows network?

  - by Scott

  What are some good ways to have patch management and systems/hardware inventory for a Windows (Server 2003 or 2008) network? For example, at a minimum knowing the basics for all the machines out on the network such as OS version, patch level, what hotfixes they have, processor, ram, etc. Even better would be knowing more details such as peripherals. Ideally if there were a way to push service packs, and hotfixes (and other software?) to the machines, that would be great. What are some options for this?

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• Terribly slow Apache2 on VM Virtualbox

  - by cadavre

  I just launched VM Virtualbox with guest Ubuntu Server on host Windows 8. Both 64bit. Everything works perfectly fine. Maybe it's because I'm not using any X... Htop shows ~25% of memory usage, everything is fine, but not Apache2. Normally it's fine, but when I send request from my browser on host (networking mode set to Bridge mode), Apache2 is turning into 1-minute-long loading process with 100% CPU time. Any ideas how to debug it? Any ideas about solving this throat problem?

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• pfsense multi-site VPN VOIP deployment

  - by sysconfig

  have main office pfsense firewall configured like this: local networks WAN - internet LAN - local network VOIP - IP phones need to connect remote offices (multi-users) and single remote users (from home) use IPSEC or OpenVPN to build "permanent" automatically connecting tunnels from remote location to main location. in remote locations, network will look like this: WAN - internet LAN - local network multiple users VOIP - multiple IP phones in order for the IP phones to work they have to be able to "see" the VOIP network and the VOIP server back at the main office for single remote users ( like from home ) the setup will be similar but only one phone and one computer so questions: best way to tie networks together? IPSEC or OpenVPN can this be setup to automatically connect ? any issues/suggestions with that design/topology ? QoS or issues with running the VOIP traffic over a VPN throughput, quality etc.. obviously depends on remote locations connection to some degree

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• Barracuda spam filter alternative - virtualization/appliance friendly?

  - by ewwhite

  I've sold and deployed Barracuda spam and web filters for years. I've always thought that the functionality was good (Barracuda Central, easy interface, effective filtering), but the hardware on the entry to midrange units is a weak point. They have single power supplies, no RAID and limited monitoring support. Personally, I think Barracuda would make a killing selling their software as a VMWare appliance, but I'm looking for something similar that I can deploy as a consultant, but will be easy for customers to manage. It should have support for server-grade hardware or the ability to be deployed as a virtual machine. Is there anything out there that's close?

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• Linux driver for Intel ICH10R

  - by Pablo Santa Cruz

  Hi! I would like to know what 64-bit Linux distribution can I use with an Intel ICH10R RAID. I have tried CentOS 5.2 and Ubuntu Server 8.04. Neither support that raid controller. Also, I would like to know where do I setup the RAID-5 I want to use. I am using a TYAN S7002 motherboard and the BIOS software does not include an option to configure the RAID as I am used to do with Dell servers... Thanks a lot in advance.

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• jetty crash trouble shooting

  - by user886356

  Recently I switch to amazon ec2 + jetty9 + oracle jdk7_u45 for cost saving. I found the jetty server is very unstable. It crash randomly without any jvm dump file. Tried to enable stdout with the dumpBeforeStop=TRUE. It won't append the dump messages to stderrout.log before crash. Seems it isn't related to OutOfMemoryError as I have enabled the gc verbose options and found it still has many available memory before crash. : 162604K-3340K(176960K), 0.2240040 secs] 248332K-89101K(373568K), 0.2736860 secs] [Times: user=0.01 sys=0.01, real=0.28 secs] Tried to downgrade to jetty8 with different jdk combination (jdk6 / jdk7). Still got the same problem. Tried to remove all jvm options and using "sudo java -jar start.jar" to run jetty. Still crash. Any other way to shoot the problem?

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• WHM new account nameservers not responding

  - by Jae Kun Choi

  I've setup a new account in WHM and updated the nameservers from Domain Registrar and it's not responding from the server. So I went to DNS functions and Nameserver IP's and I have the following ns1.example.com.au No IP 4 ns2.example.com.au No IP 4 I'm not sure whether "NO IP" part is the problem I went in to the domains and they seem to be properly set up. Below is what my Domain Registrar responded with my ticket. those nameservers are either a) offline/not responding or b) not set up correctly as nameservers. Is there a place I can check in WHM to make nameservers respond correctly? The nameservers I updated with above ns1.example.com.au and ns2.example.com.au but it's not working. WHM version is: WHM 11.32.2 (build 18)

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• Permissions problem on mounting afp drive

  - by Ron Gejman

  I am trying to mount a network drive via AFP on an Ubuntu 10.04 server machine. After installing AFP support, I use the following command: sudo mount_afp afp://USER:[email protected]/directory/ /media/dir This seems to work and it tells me that mounting succeeded. However, when I navigate to /media/dir I get the following error: cd: cfs: Input/output error Permissions in /media are: d????????? ? ? ? ? dir/ drwx------ 12 user 4.0K 2010-10-25 16:08 otherdisk/ So there is a permissions problem here. I eventually want to mount this drive automatically using fstab. What do I need to do to make the disk accessible?

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• WHM Cpanel Enable/Install MBstring module

  - by Phil Jackson

  Hi, this is my second post here and only my second day dealing with my own dedicated server. I have no previous experience in this field so please bear with me. I have successfully created a package and linked up my domain yesterday. I am getting an error regarding mb_convert_encoding() wich after doing some reading discover I have to enable or install a module?? Any way, my cpanel is "cPanel 11.25.0-R46156 - WHM 11.25.0 - X 3.9" and after some searching found mainsoftwareModule Installers but cannot find any to do with mbstrings. Could anyone point me in the right direction in what or where I should be looking?? Any help much appreciated, Regards, Phil

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• git networking for small team

  - by takeshin

  I'm trying to set up git for my programming team. My setup is: 1. example.com (Ubuntu server) IP: 192.168.1.2 (public: xxx.yyy.yyy.zzz) main git repository in /var/www/testgit user: mot (root) 2. host2, Ubuntu IP: 192.168.1.101 git clone of main repo in ~/public_html/testgit1 user: nairda 3. host3, Ubuntu IP: 192.168.1.102 git clone of main repo in ~/www/testgit2 user: mot 4. host4, Windows Vista, Samba, msysgit IP: 192.168.1.103 git clone of main repo in c:\shared\testgit3 user: ataga I start a new main repo: cd /var/www/testgit1 git init Now, a lot of questions: Which groups and users do I have to create? How to set up required ssh keys? (I'm playing with gitosis, but with no success by now.) How to make the main repo visible to other hosts? How to clone this repo on the hosts? How to pull changes from others to main repo?

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• Turn off the Linux OOM killer by default?

  - by Peter Eisentraut

  The OOM killer on Linux wreaks havoc with various applications every so often, and it appears that not much is really done on the kernel development side to improve this. Would it not be better, as a best practice when setting up a new server, to reverse the default on the memory overcommitting, that is, turn it off (vm.overcommit_memory=2) unless you know you want it on for your particular use? And what would those use cases be where you know you want the overcommitting on? As a bonus, since the behavior in case of vm.overcommit_memory=2 depends on vm.overcommit_ratio and swap space, what would be a good rule of thumb for sizing the latter two so that this whole setup keeps working reasonably?

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• Autoscale Rackspace Cloud, Scalr or DIY?

  - by Andre Jay Marcelo-Tanner

  I'm looking into creating a setup on Rackspace Cloud that will allow me to autoscale my webservers (no db) on demand. Preferably using something like response time. I've read into configuration tools like Puppet/Chef, but I'm thinking I can just launch from prepared server images that are ready to go. Is there any tool out there already that can monitor my existing node response times and then launch or scale up new ones based upon certain variables like average X load over Y time? I see there are commercial offerings like Scalr, Rightscale, but how would I do this myself?

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• How to recertify Notes .id file if you can't get into Notes Admin

  - by Ben

  I've got a bit of a catch-22 situation here. My company used to use Notes, but migrated to Exchange several years ago. As such the Notes server was mothballed. I now need to get back into Notes to get some data from an old app we had. The trouble is, all my .id files have expired. I can't recertify them, as I can't log into Notes Admin - because the .id has expired. Is there any way round this? Thanks, Ben

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• apache2 mod_proxy configuration for single threaded servers

  - by The Doctor What

  I have a multiple instances of thin running behind apache 2.2's mod_proxy. The problem I have is that a couple pages, by design, take a while to run. If I just configure apache the obvious way (just add the thin urls as BalanceMember lines and no other configurations) then what happens is if someone clicks on the long-running page, then if enough web requests happen while it is running, someone eventually gets the same thin server and has to wait. Does anyone have some best practices or suggested configuration for mod_proxy and thin? Ciao!

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• How to correctly add daemon in MacOS 10.6.6 via launchd?

  - by Eye of Hell

  Hello. I have a very simple task to accomplish: to start tomcat application server on latest MacOS as a daemon. I have performed following steps: Installed Tomcat in /Library/Tomcat/Home Validated that it runs fine by executed /Library/Tomcat/Home/bin/startup.sh Added org.apache.tomcat.plist file to /Library/LaunchDaemons as found on internet (http://blog.i18n.ro/complete-guide-for-installing-hudson-ci-on-os-x-10-6/) Instructed MacOS to load a daemon description via sudo launchctl load org.apache.tomcat.plist. It succeeded (issuing this command second time outputs "already loaded"). Instructed MacOS to start a daeon via sudo launchctl start org.apache.tomcat.plist At this point MacOS shows an error "launchctl start error: No such process". I have checked the logfile for launchd - it have no record for this error. Google says nothing. And from error text i can't figure out what is the "process" and why it is "wrong" :(. Any hints what i'm doing wrong?

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• Apache mod_wsgi error: ImportError: No module named django.core.handlers.wsgi

  - by bigmac

  I am using Python 2.7 with mod_python 3.3.1 and mod_wsgi 3.3. I get an Internal Server Error and this stack trace in the apache logs: [Thu Apr 21 10:25:37 2011] [error] [client 83.244.243.242] import django.core.handlers.wsgi [Thu Apr 21 10:25:37 2011] [error] [client 83.244.243.242] ImportError: No module named django.core.handlers.wsgi [Thu Apr 21 10:25:37 2011] [error] [client 83.244.243.242] mod_wsgi (pid=4463): Target WSGI script '/home/one/codebase/campman/wsgi_handler.py' cannot be loaded as Python module. [Thu Apr 21 10:25:37 2011] [error] [client 83.244.243.242] mod_wsgi (pid=4463): Exception occurred processing WSGI script '/home/one/codebase/campman/wsgi_handler.py'. [Thu Apr 21 10:25:37 2011] [error] [client 83.244.243.242] Traceback (most recent call last): [Thu Apr 21 10:25:37 2011] [error] [client 83.244.243.242] File "/home/one/codebase/campman/wsgi_handler.py", line 13, in <module> [Thu Apr 21 10:25:37 2011] [error] [client 83.244.243.242] import django.core.handlers.wsgi [Thu Apr 21 10:25:37 2011] [error] [client 83.244.243.242] ImportError: No module named django.core.handlers.wsgi

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• In MySQL 5.1 InnoDB, does the maximum length of a VARCHAR affect secondary index size?

  - by e_tothe_ipi

  Assuming the data is the same either way, does the maximum length of the VARCHAR affect the space usage of a secondary index? Does InnoDB use fixed length records for indexes? Assume that we're talking about MySQL 5.1, with the InnoDB COMPRESSED table format and that the field in question is defined as a VARCHAR with some length less than or equal to 255 (so that it uses only one byte for the offset). Here is the use case: I have a server with a very large table (several gigabytes). One of the fields is currently VARCHAR(7). We need it a little longer and we are thinking of making it VARCHAR(255), but we are worried that it bloat the index.

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• Slapd service won't start, unable to open pid file

  - by Foezjie

  I'm trying to set up a test LDAP-server for some developers but I'm running into some trouble. service slapd start errors so I run /usr/sbin/slapd -d 1 and this gives me the following error at the end: unable to open pid file "/var/run/ldap/slapd.pid": 13 (Permission denied) slapd destroy: freeing system resources. slapd stopped. The rights for /var/run/ldap are as follows: root@pec:/var/run/ldap# ls -ld drwxr-xr-x 2 openldap openldap 60 2012-07-04 20:45 So I don't get why there is still a permission denied. Syslog gives the following when running slapd: Jul 4 21:00:27 pec slapd[13758]: @(#) $OpenLDAP: slapd 2.4.21 (Dec 19 2011 15:40:04) $#012#011buildd@allspice:/build/buildd/openldap-2.4.21/debian/build/servers/slapd Jul 4 21:00:27 pec kernel: [8147247.203100] type=1503 audit(1341428427.953:64): operation="truncate" pid=13758 parent=20433 profile="/usr/sbin/slapd" requested_mask="::w" denied_mask="::w" fsuid=0 ouid=119 name="/var/run/ldap/slapd.pid" Can anyone point me in the right direction?

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• systemd initiated uwsgi process shuts down after a while

  - by Calvin Cheng

  So I wrote this simple systemd service script:- [Unit] Description=uwsgi server script [Service] User=web Group=web WorkingDirectory=/var/www/prod/myproject/releases/current ExecStart=/bin/bash -c 'source ~/.bash_profile; workon myproject; uwsgi --ini /var/www/prod/myproject/releases/current/myproject/uwsgi_prod.ini' [Install] WantedBy=multi-user.target which works fine - it starts up and I can see my uwsgi processes in htop. However, it inexplicably shuts down after being idle for 5 minutes. If I start this process manually in bash console by executing, as web user:- source ~/.bash_profile workon myproject uwsgi --ini /var/www/prod/myproject/releases/current/myproject/uwsgi_prod.ini my process does not die after being idle. What could the problem be?

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