通过systemctl命令执行对系统服务的操作
systemctl [OPTIONS...] COMMAND [NAME...]
例如启动网络服务
systemctl start NetworkManager
CentOS7有两个网络服务，其中network是为了兼容之前的版本，可以关掉network，只启动NetworkManager
systemctl stop network
systemctl restart NetworkManager
设置服务的开机自启动
设置自启动
systemctl enable NetworkManager
取消自启动
systemctl disable NetworkManager
查看服务的自启动情况,enable/disable/static,static依赖于其他服务的服务,本身不考虑是否自启动
systemctl list-unit-files
[root@linux ~]# systemctl list-unit-files
UNIT FILE STATE
proc-sys-fs-binfmt_misc.automount static
dev-hugepages.mount static
dev-mqueue.mount static
proc-fs-nfsd.mount static
proc-sys-fs-binfmt_misc.mount static
run-vmblock\x2dfuse.mount disabled
sys-fs-fuse-connections.mount static
sys-kernel-config.mount static
sys-kernel-debug.mount static
tmp.mount disabled
var-lib-nfs-rpc_pipefs.mount static
brandbot.path disabled
cups.path enabled
systemd-ask-password-console.path static
防火墙服务是firewalld,可用上面的命令进行停止/启动/重启/设置自启动/取消自启动
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