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通过service 启动脚本来控制守护进程（Daemon）的启动与关闭

[root@localhost yum.repos.d]# yum install -y vsftpd
[root@localhost yum.repos.d]# systemctl status vsftpd.service 
● vsftpd.service - Vsftpd ftp daemon
   Loaded: loaded (/usr/lib/systemd/system/vsftpd.service; disabled; vendor preset: disabled)
   Active: inactive (dead)
[root@localhost yum.repos.d]# cat /usr/lib/systemd/system/vsftpd.service
[Unit]
Description=Vsftpd ftp daemon
After=network-online.target

[Service]
Type=forking
ExecStart=/usr/sbin/vsftpd /etc/vsftpd/vsftpd.conf

[Install]
WantedBy=multi-user.target

自定义服务

• 清理缓存

[root@rhel-100 ~]# free -h
              total        used        free      shared  buff/cache   available
Mem:          3.6Gi       1.1Gi       1.5Gi        19Mi       1.1Gi       2.3Gi
Swap:         2.0Gi          0B       2.0Gi
[root@rhel-100 ~]# echo 3 > /proc/sys/vm/drop_caches 
[root@rhel-100 ~]# free -h
              total        used        free      shared  buff/cache   available
Mem:          3.6Gi       1.0Gi       2.3Gi        19Mi       300Mi       2.4Gi
Swap:         2.0Gi          0B       2.0Gi

• 配置服务

[root@rhel-100 system]# systemctl list-unit-files | grep memload
memload.service                                                        disabled 
[root@rhel-100 system]# cat memload.service 
[Unit]
Description=memload daemon
After=network-online.target

[Service]
Type=memtest
ExecStart=/usr/local/bin/memload 1000

[Install]
WantedBy=multi-user.target
[root@rhel-100 system]# pwd
/usr/lib/systemd/system
[root@rhel-100 system]# vim memload.service ###修改了配置文件需要daemon-relaod
[root@rhel-100 system]# cat memload.service 
[Unit]
Description=memload daemon
After=network-online.target

[Service]
Type=memtest
ExecStart=/usr/local/bin/memload 2000

[Install]
WantedBy=multi-user.target
[root@rhel-100 system]# systemctl restart memload.service 
Warning: The unit file, source configuration file or drop-ins of memload.service changed on disk. Run 'systemctl daemon-reload' to reload units.

ansible service 模块和 systemd 模块区别

• 如果启动文件被修改，此时需要daemond reload，但是service 模块不支持daemon reload，此时就需要systemd 模块。

通过ansible 配置网络

[root@rhel8-100 home]# cat network.yaml 
---
- hosts: rhel8-102
  vars:
    network_connections:
      - name: ens224
        interface_name: ens224
        type: ethernet
        ip:
          dhcp4: no
          gateway4: 192.168.26.2
          dns:
            - 192.168.26.2
          address:
            - 198.168.26.102/24
         
  roles:
  - rhel-system-roles.network
[root@rhel8-100 home]# ansible-playbook network.yaml