CentOS配置服务开机启动的方法

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CentOS设置服务开机启动的三种方法

利用chkconfig命令来配置启动级别
　　在CentOS或者RedHat其他系统下，如果是后面安装的服务，如httpd、mysqld、postfix等，安装后系统默认不会自动启动的。就算 手动执行 /etc/init.d/mysqld start 启动了服务，只要服务器重启后，系统仍然不会自动启动服务。 在这个时候，我们就需要在安装后做个设置，让系统自动启动这些服务，避免不必要的损失和麻烦。 其实命令很简单的，使用chkconfig即可。

查询chkconfig当前所有服务
　　查询当前所有服务的自动启动配置可以使用chkconfig --list，如果要查询某一个指定的服务，可以跟上服务名即可，比如要查询sshd服务。

[iyunv@localhost ~]# chkconfig --list
NetworkManager 0:off1:off2:on3:on4:on5:on6:off
abrt-ccpp      0:off1:off2:off3:on4:off5:on6:off
abrt-oops      0:off1:off2:off3:on4:off5:on6:off
abrtd          0:off1:off2:off3:on4:off5:on6:off
acpid          0:off1:off2:on3:on4:on5:on6:off
atd            0:off1:off2:off3:on4:on5:on6:off
auditd         0:off1:off2:on3:on4:on5:on6:off
autofs         0:off1:off2:off3:on4:on5:on6:off
avahi-daemon   0:off1:off2:off3:on4:on5:on6:off
bluetooth      0:off1:off2:off3:on4:on5:on6:off
certmonger     0:off1:off2:off3:on4:on5:on6:off
cpuspeed       0:off1:on2:on3:on4:on5:on6:off
crond          0:off1:off2:on3:on4:on5:on6:off
cups           0:off1:off2:on3:on4:on5:on6:off
dnsmasq        0:off1:off2:off3:off4:off5:off6:off
fcoe           0:off1:off2:on3:on4:on5:on6:off
firstboot      0:off1:off2:off3:off4:off5:off6:off
haldaemon      0:off1:off2:off3:on4:on5:on6:off
httpd          0:off1:off2:off3:off4:off5:off6:off
ip6tables      0:off1:off2:on3:on4:on5:on6:off
ipsec          0:off1:off2:off3:off4:off5:off6:off
iptables       0:off1:off2:on3:on4:on5:on6:off
irqbalance     0:off1:off2:off3:on4:on5:on6:off
iscsi          0:off1:off2:off3:on4:on5:on6:off
iscsid         0:off1:off2:off3:on4:on5:on6:off
kdump          0:off1:off2:off3:off4:off5:off6:off
livesys        0:off1:off2:off3:on4:on5:on6:off
livesys-late   0:off1:off2:off3:on4:on5:on6:off
lldpad         0:off1:off2:on3:on4:on5:on6:off
lvm2-monitor   0:off1:on2:on3:on4:on5:on6:off
mdmonitor      0:off1:off2:on3:on4:on5:on6:off
messagebus     0:off1:off2:on3:on4:on5:on6:off
multipathd     0:off1:off2:off3:off4:off5:off6:off
mysqld         0:off1:off2:off3:off4:off5:off6:off
netconsole     0:off1:off2:off3:off4:off5:off6:off
netfs          0:off1:off2:off3:on4:on5:on6:off
network        0:off1:off2:off3:off4:off5:off6:off
nfs            0:off1:off2:off3:off4:off5:off6:off
nfslock        0:off1:off2:off3:on4:on5:on6:off
nscd           0:off1:off2:off3:off4:off5:off6:off
nslcd          0:off1:off2:off3:off4:off5:off6:off
ntpd           0:off1:off2:off3:off4:off5:off6:off
ntpdate        0:off1:off2:off3:off4:off5:off6:off
oddjobd        0:off1:off2:off3:off4:off5:off6:off
openct         0:off1:off2:on3:on4:on5:on6:off
pcscd          0:off1:off2:off3:on4:on5:on6:off
portreserve    0:off1:off2:on3:on4:on5:on6:off
postfix        0:off1:off2:on3:on4:on5:on6:off
psacct         0:off1:off2:off3:off4:off5:off6:off
quota_nld      0:off1:off2:off3:off4:off5:off6:off
rdisc          0:off1:off2:off3:off4:off5:off6:off
restorecond    0:off1:off2:off3:off4:off5:off6:off
rngd           0:off1:off2:off3:off4:off5:off6:off
rpcbind        0:off1:off2:on3:on4:on5:on6:off
rpcgssd        0:off1:off2:off3:on4:on5:on6:off
rpcidmapd      0:off1:off2:off3:on4:on5:on6:off
rpcsvcgssd     0:off1:off2:off3:off4:off5:off6:off
rsyslog        0:off1:off2:on3:on4:on5:on6:off
saslauthd      0:off1:off2:off3:off4:off5:off6:off
smartd         0:off1:off2:off3:off4:off5:off6:off
snmpd          0:off1:off2:off3:off4:off5:off6:off
snmptrapd      0:off1:off2:off3:off4:off5:off6:off
spice-vdagentd 0:off1:off2:off3:off4:off5:on6:off
sshd           0:off1:off2:off3:off4:off5:off6:off
sssd           0:off1:off2:off3:off4:off5:off6:off
svnserve       0:off1:off2:off3:off4:off5:off6:off
sysstat        0:off1:on2:on3:on4:on5:on6:off
udev-post      0:off1:on2:on3:on4:on5:on6:off
vboxadd        0:off1:off2:on3:on4:on5:on6:off
vboxadd-service0:off1:off2:on3:on4:on5:on6:off
vboxadd-x11    0:off1:off2:off3:on4:off5:on6:off
vncserver      0:off1:off2:off3:off4:off5:off6:off
wdaemon        0:off1:off2:off3:off4:off5:off6:off
wpa_supplicant 0:off1:off2:off3:off4:off5:off6:off
ypbind         0:off1:off2:off3:off4:off5:off6:off
[iyunv@localhost ~]#
[iyunv@localhost ~]# chkconfig --list sshd
sshd           0:off1:off2:off3:off4:off5:off6:off
[iyunv@localhost ~]#

添加服务到chkconfig列表
　　如果这个服务尚未被添加到 chkconfig 列表中，则现需要使用 –-add 参数将其添加进去：

chkconfig --add sshd
设置或取消服务的自动启动
　　如果需要设置服务的自动启动，可以通过chkconfig的on命令设置，比如设置sshd服务为自动启动：

[iyunv@localhost ~]# chkconfig sshd on
[iyunv@localhost ~]# chkconfig --list sshd
sshd           0:off1:off2:on3:on4:on5:on6:off
[iyunv@localhost ~]#

　　这个时候2~5都是on，就表明会自动启动了。如果需要取消服务的自动启动，可以通过chkconfig的off命令取消，比如取消sshd服务的自动启动：

[iyunv@localhost ~]# chkconfig sshd off
[iyunv@localhost ~]# chkconfig --list sshd
sshd           0:off1:off2:off3:off4:off5:off6:off
[iyunv@localhost ~]#

修改 /etc/rc.d/rc.local 这个文件：
　　例如将 apache、mysql、samba、svn 等这些服务的开机自启动问题一起搞定：

vim /etc/rc.d/rc.local
#添加以下命令
#!/bin/sh
#
# This script will be executed *after* all the other init scripts.
# You can put your own initialization stuff in here if you don't
# want to do the full Sys V style init stuff.
touch /var/lock/subsys/local
/usr/sbin/apachectl start
/etc/rc.d/init.d/mysqld start
/etc/rc.d/init.d/smb start
/usr/local/subversion/bin/svnserve -d
在CentOS 7上可以使用systemctl命令来使服务默认启动
　　这里以docker.service为例，当前设置如下所示：

[iyunv@localhost ~]# systemctl status docker.service
docker.service - Docker Application Container Engine
Loaded: loaded (/usr/lib/systemd/system/docker.service; disabled)
Active: inactive (dead)
Docs: https://docs.docker.com
[iyunv@localhost ~]# systemctl list-unit-files | grep docker
docker.service                              disabled
docker.socket                               disabled
[iyunv@localhost ~]#

　　然后使用systemctl命令来使能docker服务：

[iyunv@localhost ~]# systemctl enable docker.service
ln -s '/usr/lib/systemd/system/docker.service' '/etc/systemd/system/multi-user.target.wants/docker.service'
[iyunv@localhost ~]# systemctl list-unit-files | grep docker
docker.service                              enabled
docker.socket                               disabled
[iyunv@localhost ~]#

　　然后重启服务器就可以看到docker服务启动起来了：

[iyunv@localhost ~]# systemctl list-unit-files | grep docker
docker.service                                            enabled
docker.socket                                             disabled
[iyunv@localhost ~]# systemctl status docker.service
docker.service - Docker Application Container Engine
Loaded: loaded (/usr/lib/systemd/system/docker.service; enabled)
Active: active (running) since Fri 2015-12-11 10:18:35 CST; 32s ago
Docs: https://docs.docker.com
Main PID: 1218 (docker)
CGroup: /system.slice/docker.service
└─1218 /usr/bin/docker daemon -H fd://
Dec 11 10:18:09 localhost.localdomain docker[1218]: time="2015-12-11T10:18:09.045564389+08:00" level=warning msg="Usage of loopback devices is strongly discouraged for productio...v section."
Dec 11 10:18:10 localhost.localdomain docker[1218]: time="2015-12-11T10:18:10.741368042+08:00" level=info msg="[graphdriver] using prior storage driver \"devicemapper\""
Dec 11 10:18:12 localhost.localdomain docker[1218]: time="2015-12-11T10:18:12.309207143+08:00" level=info msg="Firewalld running: true"
Dec 11 10:18:30 localhost.localdomain docker[1218]: time="2015-12-11T10:18:30.584205823+08:00" level=info msg="Default bridge (docker0) is assigned with an IP address 172.17.0.0...IP address"
Dec 11 10:18:35 localhost.localdomain docker[1218]: time="2015-12-11T10:18:35.662157286+08:00" level=info msg="Loading containers: start."
Dec 11 10:18:35 localhost.localdomain docker[1218]: ..
Dec 11 10:18:35 localhost.localdomain docker[1218]: time="2015-12-11T10:18:35.780999775+08:00" level=info msg="Loading containers: done."
Dec 11 10:18:35 localhost.localdomain docker[1218]: time="2015-12-11T10:18:35.781038888+08:00" level=info msg="Daemon has completed initialization"
Dec 11 10:18:35 localhost.localdomain docker[1218]: time="2015-12-11T10:18:35.781068669+08:00" level=info msg="Docker daemon" commit=a34a1d5 execdriver=native-0.2 graphdriver=de...rsion=1.9.1
Dec 11 10:18:35 localhost.localdomain systemd[1]: Started Docker Application Container Engine.
Hint: Some lines were ellipsized, use -l to show in full.
[iyunv@localhost ~]#