Ansible cloud computing automation

Four servers :

ansible: The management end

node01 node02 node03: Managed nodes

1) install

[root@ansible ~]# yum install ansible -y

2) view help

[root@ansible ~]# ansible-doc -l | wc -l    # View the number of modules

[root@ansible ~]# ansible-doc -s yum        # see yum Parameters of the module

[root@ansible ~]# ansible-doc yum           # View relevant help information ( Search for /EXAMPLES)

[root@ansible ~]# ansible node03 -m setup   # Get the built-in related variables of the opposite node ( Host name ip Address, etc )

3) How to view the detailed help information of a module

    View the source code : /usr/lib/python2.7/site-packages/ansible/modules/packaging/os/yum.py

    ansible-doc yum             # View relevant help information ( Search for /EXAMPLES)

Four common modules :

    yum copy file service

Several important concepts :

    install present

    uninstall absent

    upgrade latest

    exclude exclude

    Designated warehouse enablerepo

Grammar format :

    ansible Host name or group name -m Specify modules -a Specific commands

yum modular :

# Example 1: Install the latest apache Software , Update if it exists

[root@ansible ~]# ansible group1 -m yum -a "name=httpd state=latest"

# Example 2: Install the latest apache Software , Install through local warehouse

[root@ansible ~]# ansible group1 -m yum -a "name=httpd state=latest enablerepo=c7-local-http"

# Example 3: Delete apache Software

[root@ansible ~]# ansible group1 -m yum -a "name=httpd state=absent"

copy modular :

# Example 1: Local httpd.conf file Listen Port changed to 8080, Then push it to the remote server

[root@ansible ~]# ansible group1 -m copy -a "src=/etc/ansible/source_code/copy_module/httpd.conf dest=/etc/httpd/conf/httpd.conf owner=root group=root mode=644"

# Example 2: Local httpd.conf file Listen Port changed to 8088, Then push it to the far end , Check whether the last backup file exists at the remote end

[root@ansible ~]# ansible group1 -m copy -a "src=/etc/ansible/source_code/copy_module/httpd.conf dest=/etc/httpd/conf/httpd.conf owner=root group=root mode=644 backup=yes"

# Check whether there is a corresponding backup file

[root@ansible ~]# ssh node01 ls /etc/httpd/conf/httpd\*

# Example 3: Write content to the remote host file

[root@ansible ~]# ansible group1 -m copy -a "content='Hello World......\n'  dest=/var/www/html/index.html"

# Verify whether the file content corresponding to the opposite server has been modified

[root@ansible ~]# ssh node01 cat /var/www/html/index.html

file modular :

# Example 1: create a file /var/www/html/hostname.html, And set the owner Generic group jurisdiction

[root@ansible ~]# ansible group1 -m file -a "path=/var/www/html/hostname.html state=touch owner=apache group=apache mode=644"

# Check whether the file was created successfully

[root@ansible copy_module]# ssh node01 ls -lt /var/www/html/hostname.html

# Example 2:   Create directory /var/www/html/imgs, And set the owner Generic group jurisdiction

[root@ansible ~]# ansible group1 -m file -a "path=/var/www/html/imgs state=directory owner=apache group=apache mode=755"

[root@ansible ~]# ssh node01 ls -ld /var/www/html/imgs

# Example 3:   Recursive authorization directory

[root@ansible ~]# ansible group1 -m file -a "path=/var/www/html/ owner=apache group=apache mode=755"

[root@ansible ~]# ansible group1 -m file -a "path=/var/www/html/ owner=apache group=apache recurse=yes" # Recursive Authorization

service modular :

[root@ansible ~]# ansible group1 -m service -a "name=httpd state=stopped"   # Stop service first

View service status :

[root@ansible ~]# ssh node01 systemctl status httpd | grep 'Active: '

   Active:  inactive (dead) since   # stopped state

# Example 1:   start-up Httpd service

[root@ansible ~]# ansible group1 -m service -a "name=httpd state=started"

View service status :

[root@ansible ~]# ssh node01 systemctl status httpd | grep 'Active: '

   Active:  active (running) since Mon  # running state

# Example 2:   heavy load Httpd service

[root@ansible ~]# ansible group1 -m service -a "name=httpd state=reloaded"

# Example 3:   restart Httpd service

[root@ansible ~]# ansible group1 -m service -a "name=httpd state=restarted"

# Example 4:   stop it Httpd service

[root@ansible ~]# ansible group1 -m service -a "name=httpd state=stopped"

# Example 5:   start-up Httpd service , And add boot - up

[root@ansible ~]# ansible group1 -m service -a "name=httpd state=started enabled=yes"