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更多内容请查看老男孩老师的书籍：《跟老男孩学习Linux运维：Web集群实战》或者运维课程。
首先查看当前开启的服务有哪些：
老男孩老师的经验告诉我们默认只需要开通下面5个必要服务即可：
sshd |sysstat|crond|network|rsyslog
首先查看当前自启动的服务有哪些。由于工作环境基本上使用文本模式3级别，只需要查找3级别上开启的服务即可。
命令如下：
[[email protected] ~]# LANG=en (先调整成英文字符集，以方便过滤字符串)
[[email protected] ~]# chkconfig --list |grep 3:on （查看3级别下所有自启动的服务）
abrt-ccpp 0:off 1:off 2:off 3:on 4:off 5:on 6:off
abrtd 0:off 1:off 2:off 3:on 4:off 5:on 6:off
acpid 0:off 1:off 2:on 3:on 4:on 5:on 6:off
atd 0:off 1:off 2:off 3:on 4:on 5:on 6:off
auditd 0:off 1:off 2:on 3:on 4:on 5:on 6:off
blk-availability 0:off 1:on 2:on 3:on 4:on 5:on 6:off
cpuspeed 0:off 1:on 2:on 3:on 4:on 5:on 6:off
crond 0:off 1:off 2:on 3:on 4:on 5:on 6:off
haldaemon 0:off 1:off 2:off 3:on 4:on 5:on 6:off
ip6tables 0:off 1:off 2:on 3:on 4:on 5:on 6:off
irqbalance 0:off 1:off 2:off 3:on 4:on 5:on 6:off
lvm2-monitor 0:off 1:on 2:on 3:on 4:on 5:on 6:off
mdmonitor 0:off 1:off 2:on 3:on 4:on 5:on 6:off
messagebus 0:off 1:off 2:on 3:on 4:on 5:on 6:off
netfs 0:off 1:off 2:off 3:on 4:on 5:on 6:off
network 0:off 1:off 2:on 3:on 4:on 5:on 6:off
nfs 0:off 1:off 2:off 3:on 4:off 5:off 6:off
nfslock 0:off 1:off 2:off 3:on 4:on 5:on 6:off
postfix 0:off 1:off 2:on 3:on 4:on 5:on 6:off
rpcgssd 0:off 1:off 2:off 3:on 4:on 5:on 6:off
rsyslog 0:off 1:off 2:on 3:on 4:on 5:on 6:off
sshd 0:off 1:off 2:off 3:on 4:off 5:off 6:off
sysstat 0:off 1:on 2:on 3:on 4:on 5:on 6:off
udev-post 0:off 1:on 2:on 3:on 4:on 5:on 6:off
处理思路：
1.先关闭所有服务，再开启需要保留的（默认只需要开通5个必要服务即可。）
操作过程：
[[email protected] ~]# chkconfig --list |grep 3:on |awk ‘{print "chkconfig",$1,"off"}‘ |bash
（关闭所有自启动的服务）
[[email protected] ~]# chkconfig --list （查看是否所有的自服务是否都关闭了）
abrt-ccpp 0:off 1:off 2:off 3:off 4:off 5:off 6:off
abrtd 0:off 1:off 2:off 3:off 4:off 5:off 6:off
acpid 0:off 1:off 2:off 3:off 4:off 5:off 6:off
atd 0:off 1:off 2:off 3:off 4:off 5:off 6:off
auditd 0:off 1:off 2:off 3:off 4:off 5:off 6:off
blk-availability 0:off 1:on 2:off 3:off 4:off 5:off 6:off
cpuspeed 0:off 1:on 2:off 3:off 4:off 5:off 6:off
crond 0:off 1:off 2:off 3:off 4:off 5:off 6:off
haldaemon 0:off 1:off 2:off 3:off 4:off 5:off 6:off
ip6tables 0:off 1:off 2:off 3:off 4:off 5:off 6:off
iptables 0:off 1:off 2:on 3:off 4:on 5:on 6:off
irqbalance 0:off 1:off 2:off 3:off 4:off 5:off 6:off
kdump 0:off 1:off 2:off 3:off 4:on 5:on 6:off
lvm2-monitor 0:off 1:on 2:off 3:off 4:off 5:off 6:off
mdmonitor 0:off 1:off 2:off 3:off 4:off 5:off 6:off
messagebus 0:off 1:off 2:off 3:off 4:off 5:off 6:off
netconsole 0:off 1:off 2:off 3:off 4:off 5:off 6:off
netfs 0:off 1:off 2:off 3:off 4:off 5:off 6:off
network 0:off 1:off 2:off 3:off 4:off 5:off 6:off
nfs 0:off 1:off 2:off 3:off 4:off 5:off 6:off
nfs-rdma 0:off 1:off 2:off 3:off 4:off 5:off 6:off
nfslock 0:off 1:off 2:off 3:off 4:off 5:off 6:off
ntpd 0:off 1:off 2:off 3:off 4:off 5:off 6:off
ntpdate 0:off 1:off 2:off 3:off 4:off 5:off 6:off
postfix 0:off 1:off 2:off 3:off 4:off 5:off 6:off
psacct 0:off 1:off 2:off 3:off 4:off 5:off 6:off
quota_nld 0:off 1:off 2:off 3:off 4:off 5:off 6:off
rdisc 0:off 1:off 2:off 3:off 4:off 5:off 6:off
rdma 0:off 1:off 2:off 3:off 4:off 5:off 6:off
restorecond 0:off 1:off 2:off 3:off 4:off 5:off 6:off
rngd 0:off 1:off 2:off 3:off 4:off 5:off 6:off
rpcbind 0:off 1:off 2:off 3:off 4:off 5:off 6:off
rpcgssd 0:off 1:off 2:off 3:off 4:off 5:off 6:off
rpcsvcgssd 0:off 1:off 2:off 3:off 4:off 5:off 6:off
rsyslog 0:off 1:off 2:off 3:off 4:off 5:off 6:off
saslauthd 0:off 1:off 2:off 3:off 4:off 5:off 6:off
smartd 0:off 1:off 2:off 3:off 4:off 5:off 6:off
sshd 0:off 1:off 2:off 3:off 4:off 5:off 6:off
svnserve 0:off 1:off 2:off 3:off 4:off 5:off 6:off
sysstat 0:off 1:on 2:off 3:off 4:off 5:off 6:off
udev-post 0:off 1:on 2:off 3:off 4:off 5:off 6:off
然后再执行一条命令去开启需要自启动的5个服务：
[[email protected] ~]# chkconfig --list |grep 3:off|egrep "sshd|sysstat|crond|network|rsyslog" |awk ‘{print "chkconfig",$1,"on"}‘|bash （关闭所有自服务之后开启需要自启动的5个服务）
[[email protected] ~]# chkconfig --list |grep 3:on （查询设置情况并看是否只保留了我们需要的5个自启动服务）
crond 0:off 1:off 2:on 3:on 4:on 5:on 6:off
network 0:off 1:off 2:on 3:on 4:on 5:on 6:off
rsyslog 0:off 1:off 2:on 3:on 4:on 5:on 6:off
sshd 0:off 1:off 2:on 3:on 4:on 5:on 6:off
sysstat 0:off 1:on 2:on 3:on 4:on 5:on 6:off
2. 关掉不需要的，因为我们需要的服务默认都是开启的。
操作过程：
[[email protected] ~]# chkconfig --list |grep 3:on|egrep -v "sshd|sysstat|crond|network|rsyslog"|awk ‘{print "chkconfig",$1,"off"}‘|bash
（一条命令排除我们需要保留的5个自启动服务并关闭其他服务）
[[email protected] ~]# chkconfig --list |grep 3:on （查询设置情况并看是否只保留了我们需要的5个自启动服务）
crond 0:off 1:off 2:on 3:on 4:on 5:on 6:off
network 0:off 1:off 2:on 3:on 4:on 5:on 6:off
rsyslog 0:off 1:off 2:on 3:on 4:on 5:on 6:off
sshd 0:off 1:off 2:off 3:on 4:off 5:off 6:off
sysstat 0:off 1:on 2:on 3:on 4:on 5:on 6:off
相对来说第2个方法更简单一点。大家可以根据需要灵活使用。
设置自启动服务也可以通过setup和ntsysv来处理。