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asher256's blog devops/linux engineer in montreal, canada search main menu skip to primary content skip to secondary content home contact puppet module to configure lizardfs (distributed file system) on linux posted on february 24, 2017 by asher256 1 i recently published the puppet module puppet-lizardfs (give the project a star on github to support the project!) you can use to configure lizardfs, a highly-available distributed file system (dfs). lizardfs makes files secure by keeping all data in many replicas spread over several linux servers. the puppet module puppet-lizardfs is an open source project, and community contributions are essential for keeping it great. i encourage you to contribute. send me your pull requests on github! currently, puppet-lizardfs supports the operating systems debian/ubuntu and redhat/centos. a puppet example: continue reading → posted in posts | 1 reply 3 advices to write robust bash scripts posted on may 25, 2016 by asher256 reply to write robust bash scripts, i recommend you to: 1. activate the bash options: errexit, nounset add these two options at the top of your bash scripts: #!/usr/bin/env bash set -o errexit set -o nounset 1 2 3 #!/usr/bin/env bash set - o errexit set - o nounset errexit will stop your bash script each time a command in your script returns an exit code different than “0”. it does not show any message when it quits, this is why it is important to show a traceback (check the second advice below “show a bash traceback”). nounset will stop your script and output an error if you attempt to use undefined variables. nounset is very important because it can avoid you to run dangerous commands like: rm – fr “/$undefinedvariable” 2. show a bash traceback because the option “errexit” does not show any message when it stops your bash script in some cases (for example var=$(yourcommand) will exit without any message, even when yourcommand returns an exit code different than zero), i recommend you to add the code below to show a traceback each time “errexit” forces your bash script to stop: #!/usr/bin/env bash set -o errexit # stop the script each time a command fails set -o nounset # stop if you attempt to use an undef variable function bash_traceback() { local lasterr="$?" set +o xtrace local code="-1" local bash_command=${bash_command} echo "error in ${bash_source[1]}:${bash_lineno[0]} ('$bash_command' exited with status $lasterr)" if [ ${#funcname[@]} -gt 2 ]; then # print out the stack trace described by $function_stack echo "traceback of ${bash_source[1]} (most recent call last):" for ((i=0; i < ${#funcname[@]} - 1; i++)); do local funcname="${funcname[$i]}" [ "$i" -eq "0" ] && funcname=$bash_command echo -e " $i: ${bash_source[$i+1]}:${bash_lineno[$i]}\t$funcname" done fi echo "exiting with status ${code}" exit "${code}" } # provide an error handler whenever a command exits nonzero trap 'bash_traceback' err # propagate err trap handler functions, expansions and subshells set -o errtrace 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 #!/usr/bin/env bash set - o errexit # stop the script each time a command fails set - o nounset # stop if you attempt to use an undef variable function bash_traceback ( ) { local lasterr = "$?" set + o xtrace local code = "-1" local bash_command = $ { bash_command } echo "error in ${bash_source[1]}:${bash_lineno[0]} ('$bash_command' exited with status $lasterr)" if [ $ { #funcname[@]} -gt 2 ]; then # print out the stack trace described by $function_stack echo "traceback of ${bash_source[1]} (most recent call last):" for ( ( i = 0 ; i < $ { #funcname[@]} - 1; i++)); do local funcname = "${funcname[$i]}" [ "$i" - eq "0" ] && funcname = $ bash_command echo - e " $i: ${bash_source[$i+1]}:${bash_lineno[$i]}\t$funcname" done fi echo "exiting with status ${code}" exit "${code}" } # provide an error handler whenever a command exits nonzero trap 'bash_traceback' err # propagate err trap handler functions, expansions and subshells set - o errtrace the traceback will help you to know exactly which command in your bash script exited with an error code different than “0”: error in ./test.sh:43 ('false' exited with status 1) traceback of ./test.sh (most recent call last): 0: ./test.sh:43 false 1: ./test.sh:49 main exiting with status -1 1 2 3 4 5 error in . / test . sh : 43 ( 'false' exited with status 1 ) traceback of . / test . sh ( most recent call last ) : 0 : . / test . sh : 43 false 1 : . / test . sh : 49 main exiting with status - 1 3. check your bash scripts with shellcheck and follow the recommendations of advanced bash-scripting guide . posted in posts | leave a reply temporarily prevent linux from shutting down posted on may 5, 2016 by asher256 reply accidental shutdown or reboot is a serious blunder, especially if the kernel is being updated in the background. in order to prevent linux from shutting down while your update script is running, i recommend you to use systemd-inhibit: systemd-inhibit --why="doing update" ./my-update-script.sh 1 systemd - inhibit -- why = "doing update" . / my - update - script . sh systemd-inhibit will block the shutdown or reboot until the update script is finished. additional options: –who=”your name” a human-readable name — list list all active inhibition locks posted in posts | leave a reply how to stop and remove all docker images and containers posted on may 3, 2016 by asher256 reply docker is a great tool, but sometimes it can consume a lot of disk space. docker-clean is a simple bash script you can use to remove all docker images and containers with one command: $ git clone https://github.com/zzrotdesign/docker-clean $ cd docker-clean $ ./docker-clean --help options: -h or --help opens this help menu -v or --version prints the current docker-clean version -a or --all stops and removes all containers, images, and restarts docker -c or --containers stops and removes stopped and running containers -i or --images stops and removes all containers and images -net or --networks removes all empty networks -s or --stop stops all running containers --dry-run adding this additional flag at the end will list items to be removed without running the remove or stop commands -l or --log adding this as an additional flag will list all image, volume, and container deleting output 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 $ git clone https : //github.com/zzrotdesign/docker-clean $ cd docker - clean $ . / docker - clean -- help options : - h or -- help opens this help menu - v or -- version prints the current docker - clean version - a or -- all stops and removes all containers , images , and restarts docker - c or -- containers stops and removes stopped and running containers - i or -- images stops and removes all containers and images - net or -- networks removes all empty networks - s or -- stop stops all running containers -- dry - run adding this additional flag at the end will list items to be removed without running the remove or stop commands - l or -- log adding this as an additional flag will list all image , volume , and container deleting output to stop and remove all docker containers: $ ./docker-clean --containers 1 $ . / docker - clean -- containers to remove all docker images: $ ./docker-clean --images 1 $ . / docker - clean -- images posted in posts | leave a reply about blog dedicated to linux, docker, ansible, ceph distributed storage and other devops topics. my nick name is asher256 and work as a devops/linux engineer in a large-scale, high-volume production environment, at gameloft (montreal city, canada). my github projects dockerfile-patch puppet-lizardfs puppet-redis_cluster python-cmdwrapper python-dirtree other github projects recent posts puppet module to configure lizardfs (distributed file system) on linux 3 advices to write robust bash scripts temporarily prevent linux from shutting down how to stop and remove all docker images and containers recent comments amara on pupp

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