安装部署ansible

安装ansible

$ sudo yum install ansible -y

配置ansible

在ansible的hosts配置里添加两台主机

$ sudo vim /etc/ansible/hosts
db1
db2

创建密钥

[root@ops ~]# ssh-keygen
Generating public/private rsa key pair.

Enter file in which to save the key (/root/.ssh/id_rsa): Enter passphrase (empty for no passphrase):
Enter same passphrase again:
Your identification has been saved in /root/.ssh/id_rsa.
Your public key has been saved in /root/.ssh/id_rsa.pub.
The key fingerprint is:
SHA256:fHCWgg35Z9qAZMU+PX8zBhyX3+e1fh2sm5gxNGW9OIc root@ops.shenmin.com
The key's randomart image is:
+---[RSA 2048]----+
|      .+.      . |
|      ++.  .. +  |
|     o.++.+. = o.|
|      ..=== = o *|
|        SB.= E.++|
|        ..o o B+.|
|           o oooo|
|            =...o|
|           o o. .|
+----[SHA256]-----+
[root@ops ~]#
[root@ops ~]#
[root@ops ~]# ssh-copy-id db1
[root@ops ~]# ssh-copy-id db2

使用ansible

[alvin@ops ~]$ sudo ansible db1 -m ping
db1 | SUCCESS => {
    "changed": false,
    "ping": "pong"
}
[alvin@ops ~]$ sudo ansible db* -m command -a 'hostname'
db2 | SUCCESS | rc=0 >>
db2.shenmin.com

db1 | SUCCESS | rc=0 >>
db1.shenmin.com

添加主机组

这里的k8s1到k8s4都能解析为IP，是真实的服务器。

[root@ops ~]# vim /etc/ansible/hosts
[k8s]
k8s1
k8s2
k8s3
k8s4
[dbs]
db1
db2
[root@ops ~]# ssh-copy-id k8s1
[root@ops ~]# ssh-copy-id k8s2
[root@ops ~]# ssh-copy-id k8s3
[root@ops ~]# ssh-copy-id k8s4
[root@ops ~]# ansible k8s -m command -a 'ntpdate time.windows.com '
k8s4 | SUCCESS | rc=0 >>
 7 Sep 13:59:06 ntpdate[11559]: adjust time server 52.163.118.68 offset 0.004244 sec

k8s2 | SUCCESS | rc=0 >>
 7 Sep 13:59:06 ntpdate[28949]: adjust time server 52.163.118.68 offset 0.002946 sec

k8s1 | SUCCESS | rc=0 >>
 7 Sep 13:59:07 ntpdate[14539]: adjust time server 52.163.118.68 offset -0.386365 sec

k8s3 | SUCCESS | rc=0 >>
 7 Sep 13:59:07 ntpdate[706]: adjust time server 52.163.118.68 offset 0.000515 sec

[root@ops ~]#
[root@ops ~]# ansible k8s -m shell -a 'hostname;uptime'
k8s3 | SUCCESS | rc=0 >>
k8s3.shenmin.com
 13:59:11 up  4:26,  3 users,  load average: 0.24, 0.20, 0.13

k8s1 | SUCCESS | rc=0 >>
k8s1.shenmin.com
 13:59:11 up  4:26,  3 users,  load average: 0.31, 0.41, 0.41

k8s4 | SUCCESS | rc=0 >>
k8s4.shenmin.com
 13:59:11 up  4:53,  3 users,  load average: 0.24, 0.12, 0.08

k8s2 | SUCCESS | rc=0 >>
k8s2.shenmin.com
 13:59:11 up  4:26,  3 users,  load average: 0.94, 0.36, 0.16

上面我们用到了两个模块，一个command模块和一个shell模块，两个模块都是用来执行命令的，有什么区别呢？ 区别就是，我们上面在shell模块里的命令，在command里是执行不了的，command只能执行一个命令，不能使用;结束一个命令之后继续执行其他命令，也不能使用管道符。

[root@ops ~]# ansible k8s -m command -a 'ls|wc -l'
k8s4 | FAILED | rc=2 >>
[Errno 2] No such file or directory

k8s3 | FAILED | rc=2 >>
[Errno 2] No such file or directory

k8s1 | FAILED | rc=2 >>
[Errno 2] No such file or directory

k8s2 | FAILED | rc=2 >>
[Errno 2] No such file or directory

[root@ops ~]# ansible k8s -m shell -a 'ls|wc -l'
k8s1 | SUCCESS | rc=0 >>
52

k8s4 | SUCCESS | rc=0 >>
8

k8s3 | SUCCESS | rc=0 >>
12

k8s2 | SUCCESS | rc=0 >>
14

对所有服务器执行ping模块。

$ sudo ansible all -m ping