Linux 實現自動安裝服務元件以及優化核心引數

mchdba發表於2014-12-29
Linux元件優化

        安裝好Linux裸機後（安裝請參考：http://blog.itpub.net/26230597/viewspace-1380155/），還需要在其上安裝一些基礎元件，一般是手動一個個安裝，比較繁複也許會遺漏，下面整理了下，做成一個指令碼，每次run下這個指令碼就完成了基礎元件的安裝了，並且附帶優化了Linux的核心引數。

1，先配置網路，check配置為最原始的狀態
[root@wgq_idc_web_1_50 ~]# more ifcfg-eth0 
DEVICE=eth0
TYPE=Ethernet
UUID=de8199bd-d18e-45d4-85a0-7cbeb1d693f2
ONBOOT=no
NM_CONTROLLED=yes
BOOTPROTO=dhcp
HWADDR=00:0C:29:BF:E2:AB
[root@wgq_idc_web_1_50 ~]#
手動配置網路服務：
ifconfig eth0 1xx.2xx.1.50 netmask 255.255.255.0
route add default gw 1xx.2xx.1.1
service network restart


2，設定初始化域名
[root@wgq-web-1-50 ~]# more /etc/sysconfig/network
NETWORKING=yes
HOSTNAME=localhost.localdomain
[root@wgq-web-1-50 ~]#



3，編寫初始化安裝指令碼
[root@wgq_idc_web_1_50 ~]# vim init_app_shell.sh
#!/bin/bash
#IP GATEWAY parameters
if [ $# != 3 ]
  then
    echo "USAGE: $0 IPADDR GATEWAY HostName"
    echo "eg: $0 1xx.2xx.1.12 1xx.2xx.1.1 wgq_idc_mon_1_12"
exit 1
fi


#hostname configuration,注意sed後面帶變數的話，不能用'符號，因為會解析不了$3變數值。
hostname $3
sed -i "s/HOSTNAME=localhost.localdomain/HOSTNAME=$3/g" /etc/sysconfig/network


#chkconfig 
yum install -y chkconfig


#stop services
chkconfig --list |grep ":on" |awk '{print $1}' > /tmp/allonservice.txt
for i in `cat /tmp/allonservice.txt`
  do
    chkconfig $i off
  done


for k in NetworkManager crond messagebus network rsyslog sshd 
  do
    chkconfig $k on
  done




#network configuration
grep "DNS1" /etc/sysconfig/network-scripts/ifcfg-eth0
if [ $? != 0 ]
 then
cat <> /etc/sysconfig/network-scripts/ifcfg-eth0
IPADDR=$1
NETMASK=255.255.255.0
GATEWAY=$2
DNS1=2xx.1xx.136.10
EOF
fi


sed -i 's/ONBOOT=no/ONBOOT=yes/g' /etc/sysconfig/network-scripts/ifcfg-eth0
sed -i 's/BOOTPROTO=dhcp/BOOTPROTO=static/g' /etc/sysconfig/network-scripts/ifcfg-eth0
service network restart


#set nameserver
cat <> /etc/resolv.conf
nameserver $4
EOF


#selinux disabled
sed -i 's/SELINUX=enforcing/SELINUX=disabled/g' /etc/sysconfig/selinux
sed -i 's/id:5:initdefault:/id:3:initdefault:/g' /etc/inittab


#kernel optimization
grep "net.ipv4.tcp_keepalive_time = 30" /etc/sysctl.conf
if [ $? != 0 ]
  then
cat <> /etc/sysctl.conf
net.ipv4.tcp_max_tw_buckets = 6000
net.ipv4.ip_local_port_range = 1024 65000
net.ipv4.tcp_tw_recycle = 1
net.ipv4.tcp_tw_reuse = 1
net.core.somaxconn = 262144
net.core.netdev_max_backlog = 262144
net.ipv4.tcp_max_orphans = 262144
net.ipv4.tcp_max_syn_backlog = 262144
net.ipv4.tcp_synack_retries = 1
net.ipv4.tcp_syn_retries = 1
net.ipv4.tcp_fin_timeout = 1
net.ipv4.tcp_keepalive_time = 30
EOF


sed -i 's/net.bridge.bridge-nf-call-ip6tables = 0/#net.bridge.bridge-nf-call-ip6tables = 0/g' /etc/sysctl.conf
sed -i 's/net.bridge.bridge-nf-call-iptables = 0/#net.bridge.bridge-nf-call-iptables = 0/g' /etc/sysctl.conf
sed -i 's/net.bridge.bridge-nf-call-arptables = 0/#net.bridge.bridge-nf-call-arptables = 0/g' /etc/sysctl.conf
fi


sysctl -p


#epel yum source configuration
if [ ! -d /soft ]
  then 
    mkdir /soft
fi 
cd /soft 
rpm -ivh epel-release-6-8.noarch.rpm && rm -rf epel-release-6-8.noarch.rpm
sed -i 's/#baseurl=/baseurl=/g' /etc/yum.repos.d/epel.repo
sed -i 's/irrorlist=/#irrorlist=/g' /etc/yum.repos.d/epel.repo
yum clean all 
yum makecache


#system basic lib package install
yum install gcc gcc-c++ ncurses-devel.x86_64 cmake.x86_64 libaio.x86_64 bison.x86_64 gcc-c++.x86_64 bind-utils wget curl curl-devel perl openssh-clients setuptool sysstat -y


# restart the linux server 
reboot




[root@wgq_idc_web_1_50 ~]# 


4，環境準備
(1)，去http://pan.baidu.com/s/1qWodCQg下載epel-release-6-8.noarch.rpm（對應centos下載相應的安裝包），放到/soft/目錄
(2)，注意域名是初始化的，如果手動修改過了，建議改成原始的localhost.localdomain。




5，執行指令碼開始初始化安裝
開始執行，4個引數，P1：虛擬機器ip地址；P2
sh init_app_shell.sh 1xx.2xx.1.50 1xx.2xx.1.1 wgq_idc_web_1_50 202.xxx.xxx.64




6，除錯中一些報錯資訊記錄
(1)，yum install gcc*報錯：
PYCURL ERROR - "Couldn't resolve host 'mirrorlist.centos.org'"
Error: Cannot find a valid baseurl for repo:base
需要新增路由
route add default gw 192.168.180.255
或者
route add add  -net 0.0.0.0 gw 1xx.2xx.1.1

(2)，yum安裝報錯 ：
Error Downloading Packages:
  grep-2.6.3-6.el6.x86_64: failure: Packages/grep-2.6.3-6.el6.x86_64.rpm from base: [Errno 256] No more mirrors to try.
缺少dns，新增dns：
[root@wgq_idc_squid_1_11 ~]# vim /etc/resolv.conf
nameserver 2xx.1xx.136.10
重啟服務
ifconfig eth0 1xx.2xx.1.50 netmask 255.255.255.0
route add default gw 1xx.2xx.1.1
service network restart

(3)，Error: Cannot find a valid baseurl for repo:base
需要安裝
yum install chkconfig
yum install greo -y



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有，文章允許轉載，但必須以連結方式註明源地址，否則追究法律責任!>
原部落格地址： http://blog.itpub.net/26230597/viewspace-1384144/
原作者：黃杉 (mchdba)
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來自 “ ITPUB部落格 ” ，連結：http://blog.itpub.net/26230597/viewspace-1384144/，如需轉載，請註明出處，否則將追究法律責任。

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