saltstack状态判断unless与onlyif
很多时候我们在编写 state
文件时候需要进行判断,判断该目录或文件是否存在,判断该配置是否已经已添加,然后根据判断结果再决定命令或动作是否执行,这时候就需要用到了状态判断的unless
和onlyif
。
unless
unless
示例:需求创建/tmp/unless.txt
文件,存在则不创建,不存在则创建
[root@salt-master ~]# cat /home/salt/unless.sls test-unless: cmd.run: - name: touch /tmp/unless.txt - unless: test -f /tmp/unless.txt [root@salt-master ~]# salt 'salt-minion01' state.sls unless salt-minion01: ---------- ID: test-unless Function: cmd.run Name: touch /tmp/unless.txt Result: True Comment: Command "touch /tmp/unless.txt" run Started: 15:10:51.522319 Duration: 31.822 ms Changes: ---------- pid: 6538 retcode: 0 stderr: stdout: Summary for salt-minion01 ------------ Succeeded: 1 (changed=1) Failed: 0 ------------ Total states run: 1 Total run time: 31.822 ms #上面第一次执行,可以看到发生了一次更改,创建了 /tmp/unless.txt文件 [root@salt-master ~]# salt 'salt-minion01' state.sls unless salt-minion01: ---------- ID: test-unless Function: cmd.run Name: touch /tmp/unless.txt Result: True Comment: unless condition is true Started: 15:11:40.819789 Duration: 10.477 ms Changes: Summary for salt-minion01 ------------ Succeeded: 1 Failed: 0 ------------ Total states run: 1 Total run time: 10.477 ms #第二次执行,可以看到该文件已经存在,并没有再次创建
通过上面的小案例可以看出,当unless
返回为真则不执行,当unless
返回为假才执行。
onlyif
onlyif
正好和unless
相反,当onlyif
返回为真执行,当onlyif
返回为假不执行
onlyif
示例:需求,当/tmp/onlyif.txt
文件存在,则创建/tmp/onlyif
目录,不存在,则不创建/tmp/onlyif
目录
[root@salt-master ~]# cat /home/salt/onlyif.sls test-onlyif: cmd.run: - name: mkdir /tmp/onlyif - onlyif: test -f /tmp/onlyif.txt [root@salt-master ~]# salt 'salt-minion01' state.sls onlyif salt-minion01: ---------- ID: test-onlyif Function: cmd.run Name: mkdir /tmp/onlyif Result: True Comment: onlyif condition is false Started: 15:34:56.460583 Duration: 9.612 ms Changes: Summary for salt-minion01 ------------ Succeeded: 1 Failed: 0 ------------ Total states run: 1 Total run time: 9.612 ms #通过上面可以看到,由于/tmp/onlyif.txt文件不存在,并没有创建;手动创建一个/tmp/onlyif.txt文件再次执行 [root@salt-master ~]# salt 'salt-minion01' cmd.run "touch /tmp/onlyif.txt" salt-minion01: [root@salt-master ~]# salt 'salt-minion01' state.sls onlyif salt-minion01: ---------- ID: test-onlyif Function: cmd.run Name: mkdir /tmp/onlyif Result: True Comment: Command "mkdir /tmp/onlyif" run Started: 15:38:07.712492 Duration: 14.646 ms Changes: ---------- pid: 6871 retcode: 0 stderr: stdout: Summary for salt-minion01 ------------ Succeeded: 1 (changed=1) Failed: 0 ------------ Total states run: 1 Total run time: 14.646 ms #可以看到上面我们手动创建了一个/tmp/onlyif.txt文件后再次执行,则发生了改变,在/tmp/创建了onlyif目录