Getting Started with linux Manual 14 ansible use

1. Start Nginx error: nginx: [emerg] open ( ) "/run/nginx.pid" failed (2: No such file or directory)
   to create a file in / run / lower folder named nginx (if / run / does not exist, then mkdir / run / nginx / -pv)
   and then start the service execution file (available rpm -ql nginx look): I was / usr / sbin / nginx, then execute / usr / sbin / nginx -s reload
   and then you can start Nginx
2. Role-PlayBook --limit centos7 ansible-nginx.yml
   --limit host list only for the host execution host list
   -C only detect changes that may occur --check, but does not actually perform the operation
   --list-hosts lists run the task of host
3. ansible --list-hosts host list display, may be abbreviated --list
   Specific Usage: All PlayBook ansible---list
   -m Module1 module specified, the default is Command, the configuration file can be modified in /etc/ansible/ansible.cfg # module_name = command # the default module
   

4. ansible二进制安装Nginx、mariadb过程及注意要点
   Nginx：
   ```
   mkdir /data/ansible/roles/nginx/{tasks,files,templates,vars,handlers} -pv
   cd /data/ansible/roles/nginx/
   vim tasks/user.yml
   vim tasks/group.yml
   vim tasks/install.yml
   vim tasks/config.yml
   vim tasks/service.yml
   vim tasks/data.yml
   vim tasks/main.yml
   cd ..
   vim role-nginx.yml
   ansible-playbook -C role-nginx.yml
   ansible-playbook role-nginx.yml

   Centos7 If unsuccessful, the source of the problem may be yum, the following methods may be used:
   ansible centos7 -a 'mkdir /etc/yum.repos.d/repo'
   ansible centos7 -a 'Music Videos /etc/yum.repos.d/* /etc/yum.repos.d/repo .repo '
   ansible centos7 Copy -m -a' = the src / etc / yum.repos.d / Base.repo dest = / etc / yum.repos.d / Backup = Yes'
   -a -m Copy centos7 ansible 'the src = / etc / yum.repos.d / epel.repo dest = / etc / yum.repos.d / Backup = Yes'
   `` `

   mariadb
   `` `
   cd ansible / Roles /
   mkdir mysql / {files, Tasks, templates, VARs, handlers} -pv
   cd mysql / Tasks /
   vim user.yml
   vim unarchive.yml
   vim mysqllink.yml
   vim mysqldata.yml
   vim mysqldatabase.yml
   vim pathvar.yml
   vim config.yml
   vim servicefile.yml
   vim startservice.yml
   vim mysqldatadirowner.yml
   vim main.yml

   cd /usr/local/
   tar xvf mariadb-10.2.25-linux-x86_64.tar.gz
   cd mariadb-10.2.25-linux-x86_64/
   cd support-files/
   cp my-huge.cnf /data/playbook/etc/my.cnf
   vim my.cnf 添加datadir = /data/mysql （重点！！）

   cd /data/ansible/
   ansible-playbook -C role-mariadb.yml
   ansible-playbook role-mariadb.yml
   ```