centos 6.8模板机制作

前端之家收集整理的这篇文章主要介绍了centos 6.8模板机制作前端之家小编觉得挺不错的,现在分享给大家,也给大家做个参考。

第一章虚拟化NAT网络设置

使用DHCP自动获取IP地址

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第二章创建虚拟机

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第三章安装CentOS-6.8-x86_64-bin-DVD1操作系统

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第四章模板机优化

开机后使用命令ifup eth0获取到IP地址后。用SecureCRT连接。

4.1SecureCRT设置


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4.2安装linux系统后调优及安全设置

设置开机网卡自动启动

sed-i's#ONBOOT=no#ONBOOT=yes#g'/etc/sysconfig/network-scripts/ifcfg-eth0

关闭selinux

[root@mobanji~]#sed-i's#SELINUX=enforcing#SELINUX=disabled#g'/etc/sysconfig/selinux
[root@mobanji~]#getenforce
Enforcing
[root@mobanji~]#setenforcePermissive
[root@mobanji~]#getenforce
Permissive

关闭防火墙

[root@mobanji~]#/etc/init.d/iptablesstop##临时关闭
[root@mobanji~]#chkconfigiptablesoff##永久关闭开机启动

可选择的:支持中文显示,防止中文出现乱码(CRT外观-字符编码也要设置UTF-8)此处一般不要设置成中文的。linux一切都是英文的比较好,如果想看中文的再开启即可。

[root@mobanji~]#echo$LANG
en_US.UTF-8
[root@mobanji~]#sed-i's#en_US#zh_CN#g'/etc/sysconfig/i18n
[root@mobanji~]#./etc/sysconfig/i18n##.或者source都可以
[root@mobanji~]#echo$LANG
zh_CN.UTF-8

Base源更改为阿里云,并打补丁到最新

mv/etc/yum.repos.d/CentOS-Base.repo/etc/yum.repos.d/CentOS-Base.repo.backup
wget-O/etc/yum.repos.d/CentOS-Base.repo
rpm--import/etc/pki/rpm-gpg/RPM-GPG-KEY*
yumupdate-y#执行此命令升级后centos6.8就自动升级成了6.9了,再重启如下图所示:

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额外安装一些有用的软件包

[root@mobanji~]#yuminstalltreetelnetdos2unixsysstatlrzszncnmap-y

精简开机系统自启动只保留5个服务。

[root@mobanji~]#chkconfig--list|grep3:on|egrep-v"crond|sshd|network|rsyslog|sysstat"|awk'{print"chkconfig",$1,"off"}'|bash
[root@mobanji~]#chkconfig--list|grep3:on
crond0:off1:off2:on3:on4:on5:on6:off
network0:off1:off2:on3:on4:on5:on6:off
rsyslog0:off1:off2:on3:on4:on5:on6:off
sshd0:off1:off2:on3:on4:on5:on6:off
sysstat0:off1:on2:on3:on4:on5:on6:off

设置linux服务器时间同步

[root@mobanji~]#/usr/sbin/ntpdatetime.nist.gov
4Oct12:23:24ntpdate[24685]:noserversuitableforsynchronizationfound
[root@mobanji~]#echo'#timesyncbyoldboyat2017-10-04'>>/var/spool/cron/root
[root@mobanji~]#echo'*/5****/usr/sbin/ntpdatetime.nist.gov>/dev/null2>&1'>>/var/spool/cron/root
[root@mobanji~]#crontab-l
#timesyncbyoldboyat2017-10-04
*/5****/usr/sbin/ntpdatetime.nist.gov>/dev/null2>&1

历史记录数及登录超时环境变量设置

echo'exportTMOUT=300'>>/etc/profile#连接的超时时间控制时间为300秒
echo'exportHISTSIZE=5'>>/etc/profile#命令行的历史记录数为5
echo'exportHISTFILESIZE=5'>>/etc/profile#历史记录文件的命令数量
tail-3/etc/profile

内核优化(本优化适合apache,Nginx,squid等多种web应用,特殊的业务有可能需要略做调整)

net.ipv4.tcp_fin_timeout=2
net.ipv4.tcp_tw_reuse=1
net.ipv4.tcp_tw_recycle=1
net.ipv4.tcp_syncookies=1
net.ipv4.tcp_keepalive_time=600
net.ipv4.ip_local_port_range=400065000
net.ipv4.tcp_max_syn_backlog=16384
net.ipv4.tcp_max_tw_buckets=36000
net.ipv4.route.gc_timeout=100
net.ipv4.tcp_syn_retries=1
net.ipv4.tcp_synack_retries=1
net.core.somaxconn=16384
net.core.netdev_max_backlog=16384
net.ipv4.tcp_max_orphans=16384
#以下参数是对iptables防火墙的优化,防火墙不开会提示,可以忽略不理
net.nf_conntrack_max=25000000
net.netfilter.nf_conntrack_max=25000000
net.netfilter.nf_conntrack_tcp_timeout_established=180
net.netfilter.nf_conntrack_tcp_timeout_time_wait=120
net.netfilter.nf_conntrack_tcp_timeout_close_wait=60
net.netfilter.nf_conntrack_tcp_timeout_fin_wait=120

将上面的内核参数值加入vim /etc/sysctl.conf文件中,然后执行如下命令使之生效

[root@oldboy~]#sysctl-p
net.ipv4.ip_forward=0
net.ipv4.conf.default.rp_filter=1
net.ipv4.conf.default.accept_source_route=0
kernel.sysrq=0
kernel.core_uses_pid=1
net.ipv4.tcp_syncookies=1
kernel.msgmnb=65536
kernel.msgmax=65536
kernel.shmmax=68719476736
kernel.shmall=4294967296
net.ipv4.tcp_fin_timeout=2
net.ipv4.tcp_tw_reuse=1
net.ipv4.tcp_tw_recycle=1
net.ipv4.tcp_syncookies=1
net.ipv4.tcp_keepalive_time=600
net.ipv4.ip_local_port_range=400065000
net.ipv4.tcp_max_syn_backlog=16384
net.ipv4.tcp_max_tw_buckets=36000
net.ipv4.route.gc_timeout=100
net.ipv4.tcp_syn_retries=1
net.ipv4.tcp_synack_retries=1
net.core.somaxconn=16384
net.core.netdev_max_backlog=16384
net.ipv4.tcp_max_orphans=16384
error:"net.nf_conntrack_max"isanunknownkey
error:"net.netfilter.nf_conntrack_max"isanunknownkey
error:"net.netfilter.nf_conntrack_tcp_timeout_established"isanunknownkey
error:"net.netfilter.nf_conntrack_tcp_timeout_time_wait"isanunknownkey
error:"net.netfilter.nf_conntrack_tcp_timeout_close_wait"isanunknownkey
error:"net.netfilter.nf_conntrack_tcp_timeout_fin_wait"isanunknownkey

4.3配置双网卡固定ip

设置完后如下配置后重启linux系统

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设置完成后重启,然后直接用SecureCRT连接即可

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eth0网卡:删除mac地址和uuid

[root@oldboy~]#cat/etc/sysconfig/network-scripts/ifcfg-eth0
DEVICE=eth0
HWADDR=00:0c:29:59:47:0f
TYPE=Ethernet
UUID=ee7d8a04-694b-4595-9e37-b759535e7c99
ONBOOT=yes
NM_CONTROLLED=yes
BOOTPROTO=none
IPADDR=10.0.0.100
NETMASK=255.255.255.0
DNS2=202.96.128.86
GATEWAY=10.0.0.2
DNS1=10.0.0.2
USERCTL=no
PEERDNS=yes
IPV6INIT=no
[root@oldboy~]#vi/etc/sysconfig/network-scripts/ifcfg-eth0
删除如下两行即可(MAC地址和UUID)
HWADDR=00:0c:29:59:47:0f
UUID=ee7d8a04-694b-4595-9e37-b759535e7c99

eth1网卡:删除mac地址和uuid

[root@oldboy~]#cat/etc/sysconfig/network-scripts/ifcfg-eth1
DEVICE=eth1
HWADDR=00:0c:29:59:47:19
TYPE=Ethernet
UUID=e082a412-3fee-42e6-96e5-ac05b4d38d5f
ONBOOT=yes
NM_CONTROLLED=yes
BOOTPROTO=none
IPADDR=172.16.1.100
NETMASK=255.255.255.0
USERCTL=no
PEERDNS=yes
IPV6INIT=no
[root@oldboy~]#vi/etc/sysconfig/network-scripts/ifcfg-eth1
删除如下两行即可(MAC地址和UUID)
HWADDR=00:0c:29:59:47:19
UUID=e082a412-3fee-42e6-96e5-ac05b4d38d5f

清空70-persistent-net.rules

[root@oldboy~]#>/etc/udev/rules.d/70-persistent-net.rules
[root@oldboy~]#echo">/etc/udev/rules.d/70-persistent-net.rules">>/etc/rc.local
[root@oldboy~]#cat/etc/rc.local
#!/bin/sh
#
#Thisscriptwillbeexecuted*after*alltheotherinitscripts.
#Youcanputyourowninitializationstuffinhereifyoudon't
#wanttodothefullSysVstyleinitstuff.
touch/var/lock/subsys/local
>/etc/udev/rules.d/70-persistent-net.rules

设置完后,关机。然后把这个模板机,做个快照,快照名为模板机CentOS 6.8 模板机即可。

后期需要克隆虚拟机直接用链接克隆即可

原文链接:https://www.f2er.com/centos/375684.html

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