详解Ansible服务常用命令模块
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ansible可以使用命令行方式进行自动化管理，基本语法如下：
ansible 主机名 -m 模块名称 -a 模块特有参数
ansible的命令行管理工具都是由一系列模块、参数所支持的，可以在命令后面加上-h或--help获取帮助。如使用ansible-doc -h或者ansible-doc --help查看其帮助信息
ansible-doc是用来查看模块帮助信息的工具，最主要的选项 -l用来列出可使用的模块， -s用来列出某个模块的描述信息和使用示例。
以下是我列出yum模块的描述信息和操作动作：
[[email protected] ~]# ansible-doc -s yum
- name: Manages packages with the `yum‘ package manager
yum:
allow_downgrade: # Specify if the named package and version is
allowed to
downgrade a maybe
already installed
higher version of
that package.
Note that setting
allow_downgrade=T
rue can make this
module behave in
a non-idempotent
way.Ansible自带了很多模块，能够下发执行Ansible的各种管理任务。下面我列出一些较为常用的模块。
1 command模块
ansible管理工具使用-m选项来指定使用模块，默认使用command模块，即-m选项省略时会运行次模块，用于在被管理主机上运行命令
[[email protected] ~]# ansible-doc -s command
- name: Executes a command on a remote node
command:
argv: # Allows the user to provide the command as a list
vs. a string.
Only the string
or the list form
can be provided,
not both. One or
the other must be
provided.
chdir: # Change into this directory before running the
command.
creates: # A filename or (since 2.0) glob pattern. If it
already exists,
this step *won‘t*
be run.ansible-doc -l #列出所有已安装的模块 注：按q退出
ansible-doc -s yum #-s列出yum模块描述信息和操作动作
ansible 192.168.199.130 -m command -a ‘date‘ #指定IP执行date
ansible web -m command -a ‘date‘ #指定分类执行date
ansible all -m command -a ‘date‘ #所有hosts主机执行date
ansible all -a ‘ls /‘ #如果不加-m模块，则默认运行command模块下面我在ansible服务器上执行‘date’命令来查看被管理主机的时间：
[[email protected] ~]# ansible all -a ‘date‘
192.168.199.131 | CHANGED | rc=0 >>
2018年 10月 22日 星期一 22:35:53 CST
192.168.199.130 | CHANGED | rc=0 >>
2018年 10月 22日 星期一 22:35:53 CST2 cron 模块
Ansible中的cron模块用于定义计划任务。其中两种状态（state）：present表示添加（省略状态时默认使用），absent表示移除
[[email protected] ~]# ansible-doc -s cron #查看cron模块信息
- name: Manage cron.d and crontab entries
cron:
backup: # If set, create a backup of the crontab before it
is modified. The
location of the
backup is
returned in the
`backup_file‘
variable by this
module.
......添加任务计划：
[[email protected] ~]# ansible web -m cron -a ‘minute="*/1" job="/usr/bin/echo hehe" name="test hehe"‘
192.168.199.130 | SUCCESS => {
"changed": false,
"envs": [],
"jobs": [
"test hehe"
]
}
[[email protected] ~]# ansible web -a ‘crontab -l‘ #查看web主机的计划性任务
192.168.199.130 | CHANGED | rc=0 >>
#Ansible: test hehe
*/1 * * * * /usr/bin/echo hehe移除任务计划：
[[email protected] ~]# ansible web -m cron -a ‘name="test hehe" state=absent‘
192.168.199.130 | CHANGED => {
"changed": true,
"envs": [],
"jobs": []
}
[[email protected] ~]# ansible web -a ‘crontab -l‘
192.168.199.130 | CHANGED | rc=0 >>3 user模块
ansible中的user模块用于创建新用户和更改，删除已存在的用户，其中name项用来指明创建的用户名称
user模块是请求的是useadd，userdel，usermod三个指令
创建一个名为test01的用户：
[[email protected] ~]# ansible all -m user -a ‘name=test01‘
192.168.199.130 | CHANGED => {
"changed": true,
"comment": "",
"create_home": true,
"group": 1001,
"home": "/home/test01",
"name": "test01",
"shell": "/bin/bash",
"state": "present",
"system": false,
"uid": 1001
}删除test01用户：
[[email protected] ~]# ansible all -m user -a ‘name=test01 state=absent‘
192.168.199.130 | CHANGED => {
"changed": true,
"force": false,
"name": "test01",
"remove": false,
"state": "absent"
}4 group 模块
ansible中的group模块用于对用户组进行管理
group模块请求的是groupadd，groupdel,groupmod三个指令
[[email protected] ~]# ansible-doc -s group
- name: Add or remove groups
group:
gid: # Optional `GID‘ to set for the group.
name: # (required) Name of the group to manage.
state: # Whether the group should be present or not onthe remote host.
system: # If `yes‘, indicates that the group created is asystem group.下面我创建mysql组，将mysql用户添加到mysql组中
[[email protected] ~]# ansible web -m group -a ‘name=mysql gid=306 system=yes‘
192.168.199.130 | CHANGED => {
"changed": true,
"gid": 306,
"name": "mysql",
"state": "present",
"system": true
}[[email protected] ~]# ansible web -m user -a ‘name=mysql uid=306 system=yes group=mysql‘
192.168.199.130 | CHANGED => {
"changed": true,
"comment": "",
"create_home": true,
"group": 306,
"home": "/home/mysql",
"name": "mysql",
"shell": "/bin/bash",
"state": "present",
"system": true,
"uid": 306
}5 copy 模块
ansible中的copy模块用于实现文件复制和批量下发文件。其中使用src来定义本地源文件路径，使用dest定义被管理主机文件路径，使用content则是通过指定信息内容生成目标文件。
[[email protected] ~]# ansible-doc -s copy #查看copy模块指令
- name: Copies files to remote locations
copy:
attributes: # Attributes the file or directory should have. To get
supported flags look
at the man page for
`chattr‘ on the target
system. This string
should contain the
attributes in the same
order as the one
displayed by `lsattr‘.
`=‘ operator is
assumed as default,
otherwise `+‘ or `-‘
operators need to be
included in the
string.下面我将本地文件/etc/fstab复制到被管理主机上的/opt/fstab.bk，所有者设置为root，权限设置为640
[[email protected] ~]# ansible web -m copy -a ‘src=/etc/fstab dest=/opt/fstab.bk owner=root mode=644‘
192.168.199.130 | CHANGED => {
"changed": true,
"checksum": "a8b8566b1d9f28b55823c8f61f88d35d81014418",
"dest": "/opt/fstab.bk",
"gid": 0,
"group": "root",
"md5sum": "f25dda38d8c7bb5988c8607bc2a9a17b",
"mode": "0644",
"owner": "root",
"secontext": "system_u:object_r:usr_t:s0",
"size": 595,
"src": "/root/.ansible/tmp/ansible-tmp-1540220785.51-128147354820010/source",
"state": "file",
"uid": 0
}[[email protected] ~]# ll /opt/fstab.bk
-rw-r--r--. 1 root root 595 10月 22 23:06 /opt/fstab.bk接着我将"hello"写入“/opt/fstab.bk”
[[email protected] ~]# ansible web -m copy -a ‘content="hello!" dest=/opt/fstab.bk‘
192.168.199.130 | CHANGED => {
"changed": true,
"checksum": "8f7d88e901a5ad3a05d8cc0de93313fd76028f8c",
"dest": "/opt/fstab.bk",
"gid": 0,
"group": "root",
"md5sum": "5a8dd3ad0756a93ded72b823b19dd877",
"mode": "0644",
"owner": "root",
"secontext": "system_u:object_r:usr_t:s0",
"size": 6,
"src": "/root/.ansible/tmp/ansible-tmp-1540221051.34-78743719487515/source",
"state": "file",
"uid": 0
}[[email protected] ~]# cat /opt/fstab.bk
hello!6 file 模块
在ansible中使用file模块来设置文件属性。其中使用path指定文件路径，使用src定义源文件路径，使用name或dest来替换创建文件的符号链接。
下面我将web服务器中的fstab.bk文件属主设为mysql，属组设为mysql，权限设为666
[[email protected] ~]# ansible web -m file -a ‘path=/opt/fstab.bk owner=mysql group=mysql mode=666‘
192.168.199.130 | CHANGED => {
"changed": true,
"gid": 306,
"group": "mysql",
"mode": "0666",
"owner": "mysql",
"path": "/opt/fstab.bk",
"secontext": "system_u:object_r:usr_t:s0",
"size": 6,
"state": "file",
"uid": 306
}[[email protected] ~]# ll /opt/fstab.bk
-rw-rw-rw-. 1 mysql mysql 6 10月 22 23:10 /opt/fstab.bk下面我为/opt/fstab.bk/创建一个链接文件
[[email protected] ~]# ansible web -m file -a ‘src=/opt/fstab.bk path=/opt/fstab.bk.link state=link‘
192.168.199.130 | CHANGED => {
"changed": true,
"dest": "/opt/fstab.bk.link",
"gid": 0,
"group": "root",
"mode": "0777",
"owner": "root",
"secontext": "unconfined_u:object_r:usr_t:s0",
"size": 13,
"src": "/opt/fstab.bk",
"state": "link",
"uid": 0
}[[email protected] opt]# ll fstab.bk.link
lrwxrwxrwx. 1 root root 13 10月 22 23:23 fstab.bk.link -> /opt/fstab.bk7 ping 模块
在ansible中使用ping模块来检测指定主机的连通性
[[email protected] ~]# ansible all -m ping
192.168.199.130 | SUCCESS => {
"changed": false,
"ping": "pong"
}
192.168.199.131 | SUCCESS => {
"changed": false,
"ping": "pong"
}8 yum 模块
ansible中的yum模块负责在被管理主机上安装与卸载软件包，但是需要提前在每个节点配置自己的yum仓库。其中name指定要安装的软件包，还需要带上软件包的版本号，否则安装最新的软件包，使用state指定安装软件包的状态，present,latest用来表示安装，absent表示卸载。
[[email protected] ~]# ansible-doc -s yum
- name: Manages packages with the `yum‘ package manager
yum:
allow_downgrade: # Specify if the named package and version is allowed
to downgrade a maybe
already installed
higher version of that
package.
在web服务器上安装httpd服务：
[[email protected] ~]# ansible web -m yum -a ‘name=httpd‘
192.168.199.130 | CHANGED => {
"ansible_facts": {
"pkg_mgr": "yum"
},
"changed": true,
"msg": "warning: /var/cache/yum/x86_64/7/base/packages/mailcap-2.1.41-2.el7.noarch.rpm: Header V3 RSA/SHA256 Signature, key ID f4a80eb5: NOKEY
http://mirrors.njupt.edu.cn/centos/7.5.1804/os/x86_64/Packages/apr-1.4.8-3.el7_4.1.x86_64.rpm: [Errno 14] HTTP Error 302 - Found
Trying other mirror.
Importing GPG key 0xF4A80EB5:
Userid : "CentOS-7 Key (CentOS 7 Official Signing Key) <[email protected]>"
Fingerprint: 6341 ab27 53d7 8a78 a7c2 7bb1 24c6 a8a7 f4a8 0eb5
Package : centos-release-7-4.1708.el7.centos.x86_64 (@anaconda)
From : /etc/pki/rpm-gpg/RPM-GPG-KEY-CentOS-7
",
"rc": 0,
"results": [
"Loaded plugins: fastestmirror, langpacks
Loading mirror speeds from cached hostfile
* base: mirrors.njupt.edu.cn
* extras: mirrors.nju.edu.cn
* updates: mirrors.njupt.edu.cn
Resolving Dependencies
--> Running transaction check
---> Package httpd.x86_64 0:2.4.6-80.el7.centos.1 will be installed
--> Processing Dependency: httpd-tools = 2.4.6-80.el7.centos.1 for package: httpd-2.4.6-80.el7.centos.1.x86_64
--> Processing Dependency: /etc/mime.types for package: httpd-2.4.6-80.el7.centos.1.x86_64
--> Processing Dependency: libaprutil-1.so.0()(64bit) for package: httpd-2.4.6-80.el7.centos.1.x86_64
--> Processing Dependency: libapr-1.so.0()(64bit) for package: httpd-2.4.6-80.el7.centos.1.x86_64
--> Running transaction check
---> Package apr.x86_64 0:1.4.8-3.el7_4.1 will be installed
---> Package apr-util.x86_64 0:1.5.2-6.el7 will be installed
---> Package httpd-tools.x86_64 0:2.4.6-80.el7.centos.1 will be installed
---> Package mailcap.noarch 0:2.1.41-2.el7 will be installed
--> Finished Dependency Resolution
Dependencies Resolved
================================================================================
Package Arch Version Repository Size
================================================================================
Installing:
httpd x86_64 2.4.6-80.el7.centos.1 updates 2.7 M
Installing for dependencies:
apr x86_64 1.4.8-3.el7_4.1 base 103 k
apr-util x86_64 1.5.2-6.el7 base 92 k
httpd-tools x86_64 2.4.6-80.el7.centos.1 updates 90 k
mailcap noarch 2.1.41-2.el7 base 31 k
Transaction Summary
================================================================================
Install 1 Package (+4 Dependent packages)
Total download size: 3.0 M
Installed size: 10 M
Downloading packages:
Public key for mailcap-2.1.41-2.el7.noarch.rpm is not installed
Public key for httpd-tools-2.4.6-80.el7.centos.1.x86_64.rpm is not installed
--------------------------------------------------------------------------------
Total 143 kB/s | 3.0 MB 00:21
Retrieving key from file:///etc/pki/rpm-gpg/RPM-GPG-KEY-CentOS-7
Running transaction check
Running transaction test
Transaction test succeeded
Running transaction
Installing : apr-1.4.8-3.el7_4.1.x86_64 1/5
Installing : apr-util-1.5.2-6.el7.x86_64 2/5
Installing : httpd-tools-2.4.6-80.el7.centos.1.x86_64 3/5
Installing : mailcap-2.1.41-2.el7.noarch 4/5
Installing : httpd-2.4.6-80.el7.centos.1.x86_64 5/5
Verifying : mailcap-2.1.41-2.el7.noarch 1/5
Verifying : httpd-tools-2.4.6-80.el7.centos.1.x86_64 2/5
Verifying : apr-util-1.5.2-6.el7.x86_64 3/5
Verifying : apr-1.4.8-3.el7_4.1.x86_64 4/5
Verifying : httpd-2.4.6-80.el7.centos.1.x86_64 5/5
Installed:
httpd.x86_64 0:2.4.6-80.el7.centos.1
Dependency Installed:
apr.x86_64 0:1.4.8-3.el7_4.1 apr-util.x86_64 0:1.5.2-6.el7
httpd-tools.x86_64 0:2.4.6-80.el7.centos.1 mailcap.noarch 0:2.1.41-2.el7
Complete!
"
]
}[[email protected] ~]# rpm -q httpd #在web服务器上进行查看
httpd-2.4.6-80.el7.centos.1.x86_64卸载的命令为ansible web -m yum -a ‘name=httpd state=absent‘ 这里为了我下面的实验就先不卸载了
9 service 模块
在ansible模块中使用service模块来控制管理服务的运行状态。其中，使用enabled表示是否开机自动启动，取值为true或者false;使用name定义服务名称；使用state指定服务状态，取值分别为start,stopped,restarted.
下面我先查看web服务器上的httpd服务的运行状态
[[email protected] ~]# ansible web -a ‘systemctl status httpd.service‘
192.168.199.130 | FAILED | rc=3 >> #可以看到现在httpd服务是关闭状态
● httpd.service - The Apache HTTP Server
Loaded: loaded (/usr/lib/systemd/system/httpd.service; enabled; vendor preset: disabled)接着我开启web服务器上的httpd服务，并设为开机自启动
[[email protected] ~]# ansible web -m service -a ‘enabled=true name=httpd state=started‘
192.168.199.130 | SUCCESS => {
"changed": false,
"enabled": true,
"name": "httpd",
"state": "started",
"status": {
[[email protected] ~]# systemctl status httpd.service #到web服务器上查看状态
● httpd.service - The Apache HTTP Server
Loaded: loaded (/usr/lib/systemd/system/httpd.service; enabled; vendor preset: disabled)
Active: active (running) since 一 2018-10-22 23:47:51 CST; 2min 58s ago #可以看到服务为运行状态
最后我将web服务器的httpd服务进行关闭
[[email protected] ~]# ansible web -m service -a ‘name=httpd enabled=true state=stopped‘
192.168.199.130 | CHANGED => {
"changed": true,
"enabled": true,
"name": "httpd",
"state": "stopped",
"status": {
[[email protected] ~]# systemctl status httpd.service #再次到web服务器进行查看
● httpd.service - The Apache HTTP Server
Loaded: loaded (/usr/lib/systemd/system/httpd.service; enabled; vendor preset: disabled)
Active: inactive (dead) since 一 2018-10-22 23:54:30 CST; 25s ago #可以看到httpd已经关闭10 shell 模块
ansible中的shell模块可以在被管理主机上运行命令，并支持像管道符号等功能的复杂命令。
[[email protected] ~]# ansible-doc -s shell
- name: Execute commands in nodes.
shell:
chdir: # cd into this directory before running the command
creates: # a filename, when it already exists, this step will
*not* be run.
executable: # change the shell used to execute the command. Should
be an absolute path to
the executable.
free_form: # (required) The shell module takes a free form command
to run, as a string.
There‘s not an actual
option named "free
form". See the
examples!
removes: # a filename, when it does not exist, this step will
*not* be run.
stdin: # Set the stdin of the command directly to the
specified value.
warn: # if command warnings are on in ansible.cfg, do not
warn about this
particular line if set
to no/false.下面我创建一个Jerry用户，并为这个用户设置密码：
[[email protected] ~]# ansible web -m user -a ‘name=jerry‘ #创建Jerry用户
192.168.199.130 | CHANGED => {
"changed": true,
"comment": "",
"create_home": true,
"group": 1001,
"home": "/home/jerry",
"name": "jerry",
"shell": "/bin/bash",
"state": "present",
"system": false,
"uid": 1001
}
[[email protected] ~]# ansible web -m shell -a ‘echo 123456 | passwd --stdin jerry‘ #为用户设置密码为123456
192.168.199.130 | CHANGED | rc=0 >>
更改用户 jerry 的密码 。
passwd：所有的身份验证令牌已经成功更新。11 script 模块
ansible中的script模块可以将本地脚本复制到被管理主机上进行运行。需要注意的是，使用相对路径来指定脚本。
[[email protected] ~]# vim test.sh
#!/bin/bash
echo "this is test script" > /opt/script.txt
chmod 666 /opt/script.txt #写一个脚本，表示在/opt/创建一个script.txt文件，权限设为666
[[email protected] ~]# chmod +x test.sh
[[email protected] ~]# ansible web -m script -a ‘test.sh‘
192.168.199.130 | CHANGED => {
"changed": true,
"rc": 0,
"stderr": "Shared connection to 192.168.199.130 closed.
",
"stderr_lines": [
"Shared connection to 192.168.199.130 closed."
],
"stdout": "",
"stdout_lines": []
}
[[email protected] ~]# ls -l /opt/script.txt #到web服务器上进行查看
-rw-rw-rw-. 1 root root 20 10月 23 00:07 /opt/script.txt
[[email protected] ~]# cat /opt/script.txt
this is test script12 setup 模块
在ansible中使用setup模块收集，查看被管理主机的facts（faces是ansible采集被管理主机设备信息的一个功能）。每个被管理主机在接受并运行管理命令之前，都会将自己的相关信息发送给控制主机。
[[email protected] ~]# ansible web -m setup #对web服务器进行查看，显示的信息非常多，这里我只选了一部分
192.168.199.130 | SUCCESS => {
"ansible_facts": {
"ansible_all_ipv4_addresses": [
"192.168.122.1",
"192.168.199.130"
],
"ansible_all_ipv6_addresses": [
"fe80::a392:f598:b619:50"
],
"ansible_apparmor": {
"status": "disabled"
},
"ansible_architecture": "x86_64",
"ansible_bios_date": "05/19/2017",
"ansible_bios_version": "6.00",
"ansible_cmdline": {
"BOOT_IMAGE": "/boot/vmlinuz-3.10.0-693.el7.x86_64",
"LANG": "zh_CN.UTF-8",
"crashkernel": "auto",
"quiet": true,
"rhgb": true,
"ro": true,
"root": "UUID=1eead85f-d0ea-464e-b163-f9c7475dbf65"
},
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