Ansible 使用roles安装服务
创建所需要的目录# mkdir /etc/ansible/roles/nginx/{files,handlers,meta,vars,tasks,templates,default} -pv
新建tasks任务
# cd /etc/ansible/roles/nginx///进入nginx的roles目录# cat tasks/main.yml //查看配置文件内容- name: install nginx
yum: name=nginx state=present
- name: install config
template: src=files/nginx.conf.j2 dest=/etc/nginx/nginx.conf
notify: restart nginx
tags: ngxconf
- name: start nginx
service: name=nginx state=started enabled=true
提供nginx的template文件
# cat files/nginx.conf.j2 | head -30
# For more information on configuration, see:
# * Official English Documentation:
# * Official Russian Documentation:
http://nginx.org/ru/docs/user {{ runuser }}; //这个是我们自定义变量，在vars/main.yml定义
worker_processes {{ ansible_processor_vcpus }}; //以an开头通常是setup获取fastc变量
...
server {
listen {{ nginx_prot }} default_server;
#listen [::]:80 default_server;
...
提供vars的定义变量
# cat vars/main.yml
runuser: daemon
提供handlers配置文件
# cat handlers/main.yml
- name: restart nginx
service: name=nginx state=restarted
查看/etc/ansible/hosts
# cat hosts| egrep -v"^#"
172.16.0.2 nginx_prot=808
172.16.0.4 nginx_prot=8080
172.16.0.5 hname=dbserver
ps：使用roles其实就是把yaml的整个结构拆分到每个对应的同名的文件目录中去
实例操作：
查看是否安装nginx
# ansible webserver -a "rpm -q nginx"
172.16.0.4 | FAILED | rc=1 >>
package nginx is not installed
172.16.0.2 | FAILED | rc=1 >>
package nginx is not installed
运行前一定要检查，生产环境中
# ansible-playbook --check nginx.yml PLAY
***************************************************************TASK
*******************************************************************
ok:
ok:
TASK ***************************************************
changed:
changed:
TASK **************************************************
changed:
changed:
TASK *****************************************************
changed:
changed:
RUNNING HANDLER //这里提示，主要看清楚，因为我remote没安装使用提示not find
****************************************
fatal: : FAILED! => {"changed": false, "failed": true, "msg": "systemd could not find the requested service \"'nginx'\": "}
fatal: : FAILED! => {"changed": false, "failed": true, "msg": "systemd could not find the requested service \"'nginx'\": "}
NO MORE HOSTS LEFT *************************************************************
to retry, use: --limit @/etc/ansible/roles/nginx/nginx.retry
PLAY RECAP *********************************************************************
172.16.0.2 : ok=4 changed=3 unreachable=0 failed=1
172.16.0.4 : ok=4 changed=3 unreachable=0 failed=1
#
运行，是正常OK的
# ansible-playbooknginx.yml
PLAY ***************************************************************
TASK *******************************************************************
ok:
ok:
TASK ***************************************************
changed:
changed:
TASK **************************************************
changed:
changed:
TASK *****************************************************
changed:
changed:
RUNNING HANDLER ****************************************
changed:
changed:
PLAY RECAP *********************************************************************
172.16.0.2 : ok=5 changed=4 unreachable=0 failed=0
172.16.0.4 : ok=5 changed=4 unreachable=0 failed=0
#
查看，发现端口不一样，是因为nginx.conf.j2配置模板引用了/etc/ansible/hosts中的nginx_prot变量
# ansible webserver -m shell -a " netstat -tunlp | grep nginx"
172.16.0.4 | SUCCESS | rc=0 >>
tcp 0 0 0.0.0.0:8080 0.0.0.0:* LISTEN 26689/nginx: master
172.16.0.2 | SUCCESS | rc=0 >>
tcp 0 0 0.0.0.0:808 0.0.0.0:* LISTEN 26402/nginx: master
修改nginx的work process运行用户为user5（remote必须有该账号）及修改为80端口并且指定tags定义的ngxconf运行，并触发handles
# ansible-playbook -t ngxconf -e "nginx_prot=80" -e"runuser=user5"nginx.yml
PLAY ***************************************************************
TASK *******************************************************************
ok:
ok:
TASK **************************************************
changed:
changed:
RUNNING HANDLER ****************************************
changed:
changed:
PLAY RECAP *********************************************************************
172.16.0.2 : ok=3 changed=2 unreachable=0 failed=0
172.16.0.4 : ok=3 changed=2 unreachable=0 failed=0
验证，如我们所想的那样
# ansible webserver -m shell -a "netstat -tunlp| grep nginx;echo "" ;ps aux| grep 'nginx: worker process'| grep -v grep"
172.16.0.2 | SUCCESS | rc=0 >>
tcp 0 0 0.0.0.0:80 0.0.0.0:* LISTEN 26856/nginx: master
user5 268570.00.7 1247363500 ? S 13:46 0:00 nginx: worker process
user5 268580.00.7 1247363500 ? S 13:46 0:00 nginx: worker process
172.16.0.4 | SUCCESS | rc=0 >>
tcp 0 0 0.0.0.0:80 0.0.0.0:* LISTEN 27142/nginx: master
user5 271430.00.7 1247363500 ? S 13:46 0:00 nginx: worker process
user5 271440.00.7 1247363500 ? S 13:46 0:00 nginx: worker process
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