Published on February 14, 2014
Salty OPS – Saltstack Introduction By Walter Liu 2013/12/24
Before Saltstack (This section is borrowed slides from slideshare)
Basics Commands and misc
Basic components Salt-master Salt-minion Salt-syndic: for large deployment or cross data-center.
Basic files of Salt Configuration files /etc/salt/master /etc/salt/minion /etc/salt/minion_id (generated when first time start daemon) /etc/salt/pki/ (generated when first time start daemon) Log: /var/log/salt/ GITFS cache: /var/cache/salt/master/gitfs/refs/master/
Basic command salt salt –v "*" test.ping salt –v –L “web1,web2” test.ping salt –v –E “web” test.ping Salt –v –N group1 test.ping salt-key –a, salt-key -d salt-call
Update to newest state salt –v '*' state.highstate
Copy file to minions salt „*‟ cp.get_file salt://path/to/file /minion/path/to/file salt „*‟ cp.get_dir salt://path/to/dir/ /minion/path/to/dir/
Information commands salt '*' sys.doc [module] salt '*' grains.items salt '*' pillar.items
Package something and Run command salt '*' pkg.install nginx salt '*' pkg.remove nginx salt '*' cmd.run ifconfig
Batch Size Use batch size to rolling web server restart. Example: salt “websvr*” –batch-size 25% apache.signal restart salt “websvr*” –batch-size 10 apache.signal restart
Troubleshooting and Test your command Use salt-call to run locally Add test=True to just view what will be done. example: salt-call -l info state.highstate test=True salt '*' state.highstate test=True salt „testsvr01‟ state.sls nginx test=True Demo: Test failed. only salt-call could see the error.
Let‟s run some examples.
Installation (CentOS) yum install salt-master yum install salt-minion yum install salt-api yum install python-halite Other OS wget -O - http://bootstrap.saltstack.org | sudo sh
Re-initialize demo environment salt "*" pkg.remove nginx salt “*” cmd.run “rm /etc/nginx/conf.d/*” salt-key -D
Add a new machine to Salt Minion: edit /etc/salt/minion Minion: hostname change to “www-01.dc1” Minion: service salt-minion start Master: salt-key -A
Configure installation in Salty way Master: edit /etc/salt/master Master: Add file top.sls Master: Add file nginx.sls Minion: salt-call -l debug state.highstate test=True Master: salt "*" state.highstate test=True Execute on master: salt "*" state.highstate
Add another new machine to salt Minion: Add another machine. (hostname) Master: salt "*" state.highstate
Add a managed config file Master: edit top.sls, add dc1 directives. Master: Add dc1/web.sls Master: Add conf/dc1/www.conf Master: salt "*" state.highstate
Add dc2 managed config file Master: edit top.sls, add dc1 directives. Master: Add dc2/web.sls Master: Add conf/dc2/www.conf Master: salt "*" state.highstate
Grains in short Key values items of minion hardware/env. Only acquire at salt-minion startup. May be used in sls/template. Let‟s see how to config by domain/hostname. Master: salt „*‟ grains.items Master: Add web_general/web.sls Master: Modify top.sls Master: Add conf/dc3/www.conf Master: salt-call „*.dc3‟ highstate test=True
Pillar in short Usage Highly Sensitive Data Minion Configuration Variables Arbitrary Data Example, DB username, password Configure config file by hostname
GITFS /etc/salt/master, change below configuration fileserver_backend: - git Gitfs_remotes: - git@gitlab…….. salt-run fileserver.update Another method: Or only use gitfs to host config files.
Check config before restart Application support check config in service reload (“init.d”). Return error code if failed. Use cmd.wait: - name: ”nginx -s reload” # do reload - onlyif: “nginx -t” # test if config is ok. - watch: - file: /etc/nginx/conf.d/my_web.conf
Collaboration RD Installation sls: “nginx.sls” User Config sls: “web_general/web.sls” User Config template: “www_redis.conf.template” OPS top.sls pillar/top.sls
Reference for writing SLS Salt Formulars on github https://github.com/saltstack-formulas Salt-states on github https://github.com/saltstack/salt-states
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