1.

使用 systemctl list-unit-files 可以查看启动项 

systemctl list-unit-files | grep enable 过滤查看启动项如下

abrt-ccpp.service                                enabled abrt为auto bug report的缩写 用于bug报告 关闭
abrt-oops.service                                enabled ---------------------- 
abrt-vmcore.service                              enabled ----------------------
abrt-xorg.service                                enabled ----------------------
abrtd.service                                      enabled   ----------------------
auditd.service                                   enabled 安全审计 保留
autovt@.service                               enabled 登陆相关 保留
crond.service                                          enabled 定时任务 保留
dbus-org.freedesktop.NetworkManager.service    enabled 桌面网卡管理 关闭
dbus-org.freedesktop.nm-dispatcher.service         enabled ----------------------
getty@.service                                enabled tty控制台相关 保留
irqbalance.service                          enabled 优化系统中断分配 保留
kdump.service                                enabled 内核崩溃信息捕获 自定
microcode.service                        enabled 处理器稳定性增强 保留
NetworkManager-dispatcher.service              enabled 网卡守护进程 关闭
NetworkManager.service                        enabled ----------------------
postfix.service                            enabled 邮件服务 关闭
rsyslog.service                              enabled 日志服务 保留
snmpd.service                                enabled snmp监控 数据抓取 保留
sshd.service                                  enabled ssh登陆 保留
systemd-readahead-collect.service             enabled 内核调用--预读取 保留
systemd-readahead-drop.service                enabled ----------------------
systemd-readahead-replay.service              enabled ----------------------
tuned.service                                     enabled 
default.target                                 enabled 默认启动项 multi-user.target的软连接 保留
multi-user.target                             enabled 启动用户命令环境 保留
remote-fs.target                               enabled 集合远程文件挂载点 自定
runlevel2.target                              enabled 运行级别 用于兼容6的SysV 保留
runlevel3.target                              enabled ----------------------
runlevel4.target                              enabled ----------------------

关闭一下开机启动服务

systemctl disable abrt-ccpp.service
systemctl disable abrt-oops.service
systemctl disable abrt-vmcore.service
systemctl disable abrt-xorg.service
systemctl disable abrtd.service
systemctl disable accounts-daemon.service
systemctl disable atd.service
systemctl disable auditd.service
systemctl disable autovt@.service
systemctl disable avahi-daemon.service
systemctl disable bluetooth.service
systemctl disable cups.service
systemctl disable dbus-org.bluez.service
systemctl disable dbus-org.fedoraproject.FirewallD1.service
systemctl disable dbus-org.freedesktop.Avahi.service
systemctl disable dbus-org.freedesktop.ModemManager1.service
systemctl disable dbus-org.freedesktop.NetworkManager.service
systemctl disable dbus-org.freedesktop.nm-dispatcher.service
systemctl disable display-manager.service
systemctl disable dmraid-activation.service
systemctl disable firewalld.service
systemctl disable gdm.service
systemctl disable irqbalance.service
systemctl disable iscsi.service
systemctl disable ksm.service
systemctl disable ksmtuned.service
systemctl disable libstoragemgmt.service
systemctl disable libvirtd.service
systemctl disable lvm2-monitor.service
systemctl disable mcelog.service
systemctl disable mdmonitor.service
systemctl disable microcode.service
systemctl disable ModemManager.service
systemctl disable multipathd.service
systemctl disable NetworkManager-dispatcher.service
systemctl disable NetworkManager.service
systemctl disable postfix.service
systemctl disable qemu-guest-agent.service
systemctl disable rngd.service
systemctl disable rtkit-daemon.service
systemctl disable smartd.service
systemctl disable spice-vdagentd.service
systemctl disable systemd-readahead-collect.service
systemctl disable systemd-readahead-drop.service
systemctl disable systemd-readahead-replay.service
systemctl disable tuned.service
systemctl disable vgauthd.service
systemctl disable vmtoolsd.service

2.systemctl 用法：

显示服务状态：systemctl status docker.service

列出服务层级和依赖关系：systemctl list-dependencies docker.service

启动服务：systemctl start docker.service

关闭服务：systemctl stop docker.service

重启服务：systemctl restart docker.service

设置服务自启动：systemctl enable docker.service

禁止服务自启动：systemctl disable docker.service

查看服务是否自启动：systemctl is-enabled docker.service

列出系统所有服务的启动情况：systemctl list-units --type=service

列出所有自启动服务：systemctl list-unit-files|grep enabled

对应的旧指令（chkconfig、service）

显示服务状态：service docker status
列出服务层级和依赖关系：systemctl list-dependencies docker.service

启动服务：service docker start
关闭服务：service docker stop
重启服务：service docker restart

设置服务自启动：chkconfig --level 3 docker on
禁止服务自启动：chkconfig --level 3 docker off

查看服务是否自启动：chkconfig --list docker
列出系统所有服务的启动情况：chkconfig --list