Tip

I’m playing a lot with Docker lately. Building images, and then rebuilding, and then building again… It’s pretty boring. To automate this task a little I used inotify to build automatically after I changed any file. This trick could be used in many different situations. You will need inotify-tools package: sudo apt-get install -y inotify-tools Then run something like this: while inotifywait -e modify -r .; do docker-compose build; done This commands will rebuild my Docker images after any file change in current directory....

When I started playing with Docker I was running a lot of commands to build image, delete containers running on old image, run containers based on new image, etc… A lot of log commands with links, volumes, etc… Then I started searching for something to automate this task and here I get to docker-compse command, this is how you may install it: pip install docker-compose And install additional bash completions (run as root):...

I’ve played with Docker a little in it early days but didn’t stick for longer with it. It’s stable now so I wanted to check how it’s running now. I really can’t accept this method of installation: curl -fsSL https://get.docker.com/ | sh I think that world is going to it’s end when I see such scritps… I prefer to do this manually, knowing exactly what I have to do. Install prerequisites:...

I started playing with Docker and here I will write some commands that where not so obvious at beginning 😃 List running containers: docker ps List also not running containers: docker ps -a Remove all containers (be careful with that): docker rm $(docker ps -a -q) Remove all images: docker rmi $(docker images -q) Docker won’t remove any old volumes used by containers, so after some time you may be interested in deleting them all:...

I was doing a lot of changes to my old posts, switched to HTTPS, etc. Sometimes it was useful to change some particular text in all my old posts at a time, but there is no such feature in WordPress. But WordPress runs on MySQL and I could use SQL query to update such posts. Make backup - it’s not required but strongly advised 😃 Now use this query as template to replace in place whatever you need: ...

From few days I have access to UPC’s www.horizon.tv  external link platform - until now it was useless on Linux. But there is Pipelight that will use Wine to emulate Silverlight on Linux and it’s working pretty well - you’re just few commands away from achieving that: # stop browser killall firefox # remove old version if you have it sudo apt-get remove pipelight Now configure repos and install packages:...

I was looking at backup task running on my desk and saw that it’s spending a lot of time on ~/.local/share/zeitgeist directory. I checked and it had 4.6GB: du -sh ~/.local/share/zeitgeist/* 118M activity.sqlite 44M activity.sqlite.bck 32K activity.sqlite-shm 4,4G activity.sqlite-wal 311M fts.index WTF? Fortunately I found here  external link that I could easily delete some of this: zeitgeist-daemon --quit Now check that it’s not running: ps axu | grep zeitgeist-daemon timor 9105 0....

Sometime you need to make quick and dirty image backup of VM running on XenServer and this post is about such case 😃 List machines: xl list Name ID Mem VCPUs State Time(s) Domain-0 0 4066 8 r----- 3526567.3 webfront1.example.com 1 4096 4 r----- 3186487.2 webfront2.example.com 2 2048 2 -b---- 920408.2 Now you may export one: xe vm-export vm=webfront1.example.com filename=/srv/backup/webfront.xva Export succeeded You may also use uuid for that - list machines with xe vm-list (best with less) and then:...

Sometimes deployment process or other havy task may cause some Nagios checks to rise below normal levels and bother admin. If this is expected and you want to add downtime on host/service during this task you may use this script: #!/bin/bash function die { echo $1; exit 1; } if [[ $# -eq 0 ]] ; then die "Give hostname and time in minutes as parameter!" fi if [[ $# -eq 1 ]] ; then MINUTES=15 else MINUTES=$2 fi HOST=$1 NAGURL=http://nagios....

From the first moment I heard about Let’s Encrypt I liked it and wanted to use it as fast as possible. But the more I read how they want to implement it, the more I dislike it. Current project with automatic configuration is not what I want to use at all. I have many very complicated configs and I do not trust such tools enough to use them. I like UNIX’s single purpose principle, tools should do one thing and do it well - nothing more....