centos7.4 系统优化

static 表示该服务与其他服务相关联,不能单独设置该服务的启动状态
disabled 表示禁止开机启动
enabled 表示允许开机启动

auditd.service                                enabled 
autovt@.service                               enabled 
chronyd.service                               enabled 
	crond.service                                 enabled 
dbus-org.freedesktop.NetworkManager.service   enabled 
dbus-org.freedesktop.nm-dispatcher.service    enabled 
getty@.service                                enabled 
irqbalance.service                            enabled 
microcode.service                             enabled 
	NetworkManager-dispatcher.service             enabled 
	NetworkManager.service                        enabled 
postfix.service                               enabled 
rpcbind.service                               enabled 
rsyslog.service                               enabled 
sshd.service                                  enabled 
systemd-readahead-collect.service             enabled 
systemd-readahead-drop.service                enabled 
systemd-readahead-replay.service              enabled 
tuned.service                                 enabled 
vgauthd.service                               enabled 
vmtoolsd.service                              enabled 
rpcbind.socket                                enabled 
default.target                                enabled 
multi-user.target                             enabled 
nfs-client.target                             enabled 
remote-fs.target                              enabled 
runlevel2.target                              enabled 
runlevel3.target                              enabled 
runlevel4.target                              enabled