adventuresindevops.co.uk

Adventures in DevOps

Puppet runs 'syncing' up. So Recently we have had a weird issue at $work with puppet where the puppet runs on quite a lot of servers have appeared to all bunch up and run at the same time. Like this video, but instead of metronomes you have 1800 servers that were once staggered all…. Adventures with loadbalanced multimaster puppet. Blocking wordpress/joomla brute force attempts on cPanel. Currently it's a manual process to sign a hosts certificate request on our puppetmaster, which is fine for normal ser...

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Puppet runs 'syncing' up. So Recently we have had a weird issue at $work with puppet where the puppet runs on quite a lot of servers have appeared to all bunch up and run at the same time. Like this video, but instead of metronomes you have 1800 servers that were once staggered all…. Adventures with loadbalanced multimaster puppet. Blocking wordpress/joomla brute force attempts on cPanel. Currently it's a manual process to sign a hosts certificate request on our puppetmaster, which is fine for normal ser...

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Adventures in DevOps | adventuresindevops.co.uk Reviews

https://adventuresindevops.co.uk

Puppet runs 'syncing' up. So Recently we have had a weird issue at $work with puppet where the puppet runs on quite a lot of servers have appeared to all bunch up and run at the same time. Like this video, but instead of metronomes you have 1800 servers that were once staggered all…. Adventures with loadbalanced multimaster puppet. Blocking wordpress/joomla brute force attempts on cPanel. Currently it's a manual process to sign a hosts certificate request on our puppetmaster, which is fine for normal ser...

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adventuresindevops.co.uk

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Adventures in DevOps

http://adventuresindevops.co.uk/page/2

Currently it's a manual process to sign a hosts certificate request on our puppetmaster, which is fine for normal server installations but as I have been automating more of our cPanel VDS setups there ends up being a bunch of certs that need to signed, which then get forgotten as…. Am I in screen? Patching OpenSSL's heartbleed with puppet. I figured now that we have most systems added to puppet that we should probably be monitoring the puppet agent to make sure it's actually running after encounting a fe...

2

Blocking wordpress/joomla brute force attempts on cPanel.

http://adventuresindevops.co.uk/blocking-wordpressjoomla-brute-force-attempts-on-cpanel

Blocking wordpress/joomla brute force attempts on cPanel. As $work is a hosting provider we have lots of cPanel servers, so naturally they come under bruteforce attempts by bots/hacked sites. At first I wanted to create a script to monitor how many IPs were attempting to bruceforce login pages of sites on our shared servers, but it was soon changed to deny IPs with over a set number of connections (with csf. The script runs every 5 minutes via cron (puppet ensured! The log entries look like so:. 156 188&...

3

Patching OpenSSL's heartbleed with puppet.

http://adventuresindevops.co.uk/patching-openssls-heartbleed-with-puppet

Patching OpenSSL's heartbleed with puppet. Everyone is aware of the heartbleed. Exploit for OpenSSL, since it's been all over the news/tech sites so I won't ramble on about it. I'm just going to show how I used puppet to patch our vunerable servers. We currently have over 1500 hosts on puppet, of which the majority are cPanel servers and run CentOS. Thankfully less than 40% run CentOS6, which was affected by the exploit. So if the OS release number is 6 (using the fact from the awesome facter.

4

Am I in screen?

http://adventuresindevops.co.uk/am-i-in-screen

Am I in screen? I keep having the issue of accidently attaching another screen session inside of an already attached screen session on my bouncebox at work (which has about 19 screen sessions running.) and because just doing screen -ls and looking for which one is Attached is too much common sense I wrote a little script to tell me, it also has the super handy feature of telling me which session I am in. You are in screen session: 22704.vds. Proudly published with Ghost.

5

Puppet runs 'syncing' up.

http://adventuresindevops.co.uk/puppet-runs-syncing-up

Puppet runs 'syncing' up. So Recently we have had a weird issue at $work with puppet where the puppet runs on quite a lot of servers have appeared to all bunch up and run at the same time. Like this video, but instead of metronomes you have 1800 servers that were once staggered all deciding to request their catalogs from the puppetmasters. This can been be seen in the network graph for one of the puppetmasters. You can see the different in network usage after all the agents were changed to cron. After ad...

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adventuresindevops.com

Patching OpenSSL's heartbleed with puppet.

http://www.adventuresindevops.com/patching-openssls-heartbleed-with-puppet

Patching OpenSSL's heartbleed with puppet. Everyone is aware of the heartbleed. Exploit for OpenSSL, since it's been all over the news/tech sites so I won't ramble on about it. I'm just going to show how I used puppet to patch our vunerable servers. We currently have over 1500 hosts on puppet, of which the majority are cPanel servers and run CentOS. Thankfully less than 40% run CentOS6, which was affected by the exploit. So if the OS release number is 6 (using the fact from the awesome facter.

adventuresindevops.com

Blocking wordpress/joomla brute force attempts on cPanel.

http://www.adventuresindevops.com/blocking-wordpressjoomla-brute-force-attempts-on-cpanel

Blocking wordpress/joomla brute force attempts on cPanel. As $work is a hosting provider we have lots of cPanel servers, so naturally they come under bruteforce attempts by bots/hacked sites. At first I wanted to create a script to monitor how many IPs were attempting to bruceforce login pages of sites on our shared servers, but it was soon changed to deny IPs with over a set number of connections (with csf. The script runs every 5 minutes via cron (puppet ensured! The log entries look like so:. 156 188&...

adventuresindevops.com

Nagios: check_puppetagent

http://www.adventuresindevops.com/nagios-check_puppetagent

It's deployed to every server with our monitoring module:. And I have added an exec to our monitoring module to ensure that the nagios user has the correct permissions in sudoers to execute the plugin:. Then finally the line in the nrpe config looks like:. Proudly published with Ghost.

adventuresindevops.com

Am I in screen?

http://www.adventuresindevops.com/am-i-in-screen

Am I in screen? I keep having the issue of accidently attaching another screen session inside of an already attached screen session on my bouncebox at work (which has about 19 screen sessions running.) and because just doing screen -ls and looking for which one is Attached is too much common sense I wrote a little script to tell me, it also has the super handy feature of telling me which session I am in. You are in screen session: 22704.vds. Proudly published with Ghost.

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http://blog.ab5w.com/about

Fixes and misc blog. Proudly published with Ghost.

adventuresindevops.com

Adventures with loadbalanced multimaster puppet.

http://www.adventuresindevops.com/adventures-with-loadbalanced-multimaster-puppet

Adventures with loadbalanced multimaster puppet. At $work we use glorious puppet for our configuration management needs. The first version of our puppetmaster was a xen virtual machine with 2 cores, 8GB RAM and 60GB diskspace. This was fine for a while. However soon it started struggling under the load as the amount of servers managed increased, so the puppetmaster was upgraded to a Dell R320 with 12 cores, 32GB RAM and two 240GB SSDs in RAID1. However that's not what happened, instead we had what I will...

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Adventures in DevOps

Puppet runs 'syncing' up. So Recently we have had a weird issue at $work with puppet where the puppet runs on quite a lot of servers have appeared to all bunch up and run at the same time. Like this video, but instead of metronomes you have 1800 servers that were once staggered all…. Adventures with loadbalanced multimaster puppet. Blocking wordpress/joomla brute force attempts on cPanel. Currently it's a manual process to sign a hosts certificate request on our puppetmaster, which is fine for normal ser...

adventuresindevops.com

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Adventures with loadbalanced multimaster puppet. At $work we use glorious puppet for our configuration management needs. The first version of our puppetmaster was a xen virtual machine with 2 cores, 8GB RAM and 60GB diskspace. This was fine for a while. However soon it started struggling under the load as the amount of servers managed…. Blocking wordpress/joomla brute force attempts on cPanel. Am I in screen? I keep having the issue of accidently attaching another screen session inside of an already atta...

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