以下是我在Ansible中实现的一段代码，它试图configuration一个MySQL复制：
- stat: path=/etc/mysql/ansible.repl register: check_sql_path - name: create replicator user mysql_user: name: "replicator" host: "%" password: "{{ mypass.password_replication }}" priv: "*.*:REPLICATION SLAVE" state: present notify: - restart mysql - mysql_replication: mode: changemaster master_host: hostvars[inventory_hostname]['ansible_default_ipv4']['address'] master_user: replicator master_password: "{{ mypass.password_replication }}" when: check_sql_path.stat.exists == false notify: - restart mysql - command: touch /etc/mysql/repl.ansible when: check_sql_path.stat.exists == false 但在这之前，它会检查是否
check_sql_path.stat.exists is false
当Ansible第一次运行时，variablescheck_sql_path.stat.exists被设置为true，所以第二次Ansible被调用，它不执行这个代码块。
但不知何故，这是在我的第二次运行中执行，我得到以下exception：
==> site: TASK [mysql_replication] ******************************************************* ==> site: fatal: [localhost]: FAILED! => {"changed": false, "failed": true, "msg": "(1198, 'This operation cannot be performed with a running slave; run STOP SLAVE first'). Query == CHANGE MASTER TO ['MASTER_HOST=%(master_host)s', 'MASTER_USER=%(master_user)s', 'MASTER_PASSWORD=%(master_password)s']"} ==> site: to retry, use: --limit @/vagrant/ansible/playbook.retry
看起来Ansible并没有考虑when情况。
我也检查了服务器和文件/etc/mysql/ansible.repl是第一次创build。
任何想法我可能在这里做错了吗？
您正在检查/etc/mysql/ansible.repl是否存在，并在/etc/mysql/repl.ansible上运行touch命令。 文件名称是不同的。
为了避免错误使用常量（定义为variables，可能与有意义的名称）。
也使用一致的YAML语法（即不要混用= :样式）和本地模块（ file而不是command: touch ）。
vars: mysql_repl_flag_path: /etc/mysql/ansible.repl tasks: - stat: path: "{{ mysql_repl_flag_path }}" register: mysql_repl_flag # two tasks skipped for clarity - file: path: "{{ mysql_repl_flag_path }}" state: touch # because it is "touch" operation, the following condition is not necessary: # when: mysql_repl_flag.stat.exists == false # it also could be simpler: # when: not mysql_repl_flag.stat.exists