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详解Linux 服务管理两种方式service和systemctl
Linux 服务管理两种方式service和systemctl
1.service命令
service命令其实是去/etc/init.d目录下,去执行相关程序
# service命令启动redis脚本
service redis start
# 直接启动redis脚本
/etc/init.d/redis start
# 开机自启动
update-rc.d redis defaults
其中脚本需要我们自己编写
2.systemctl命令
systemd是Linux系统最新的初始化系统(init),作用是提高系统的启动速度,尽可能启动较少的进程,尽可能更多进程并发启动。
systemd对应的进程管理命令是systemctl
1)systemctl命令兼容了service
即systemctl也会去/etc/init.d目录下,查看,执行相关程序
systemctl redis start
systemctl redis stop
# 开机自启动
systemctl enable redis
2)systemctl命令管理systemd的资源Unit
systemd的Unit放在目录/usr/lib/systemd/system(Centos)或/etc/systemd/system(Ubuntu)
主要有四种类型文件.mount,.service,.target,.wants
.mount文件
.mount文件定义了一个挂载点,[Mount]节点里配置了What,Where,Type三个数据项
等同于以下命令:
mount -t hugetlbfs /dev/hugepages hugetlbfs
.service文件
.service文件定义了一个服务,分为[Unit],[Service],[Install]三个小节
[Unit]
Description:描述,
After:在network.target,auditd.service启动后才启动
ConditionPathExists: 执行条件
[Service]
EnvironmentFile:变量所在文件
ExecStart: 执行启动脚本
Restart: fail时重启
[Install]
Alias:服务别名
WangtedBy: 多用户模式下需要的
.target文件
.target定义了一些基础的组件,供.service文件调用
.wants文件定义了要执行的文件集合,每次执行,.wants文件夹里面的文件都会执行
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