centos 7安裝好KVM之後還要安裝虛擬機，通過VNC連接手動安裝centos 7虛擬機太麻煩了，所以無人值守安裝是做好的。簡單記錄下。

無人值守安裝centos 7前提是要安裝KVM，並且能手動創建虛擬機。
首先創建centos7.ks.cfg文件 vi /root/centos7.ks.cfg

install
#禁用第一次啟動時設置系統的向導
firstboot --disabled
eula --agreed
reboot
 
# 系統語言
lang en_US.UTF-8
keyboard us
# 設置時區
timezone --isUtc Asia/Shanghai
# 關閉selinux和防火墻
selinux 
 
--disabled
firewall --disabled
# 開啟的服務
services --enabled=sshd,ntpd,ntpdate,network
 
# 網絡設置比較復雜，建議安裝後再設置
# network --hostname pandora
 
# 啟動方式、自動分區
clearpart --all --initlabel
bootloader --location=mbr
autopart --type=lvm
zerombr
 
# root 密碼為123@abc#
auth --useshadow --enablemd5
rootpw --iscrypted $6
 
$nLlYENVDvCsM/2SX$ZD6JgRkeuN1nW239DA53b33Yyl7j0MuAKCY/CKQ/YSdA3/6sBOqInIO67JJmssHb3HTCQLj4OlVfzwt7m8Bin0
#rootpw 123456 (明文)
 
#repo --name=base --baseurl=http://centos.mirrors.ovh.net/ftp.centos.org/7/os/x86_64
#url --url="http://centos.mirrors.ovh.net/ftp.centos.org/7/os/x86_64"
 
# 最小化安裝
%packages --nobase --ignoremissing
@core
 
#安裝一些組件
acpid
net
 
-tools
ntp
ntpdate
wget
%end
 
%post
echo "ttyS0" >> /etc/securetty
sed  -i ‘s/1:2345:respawn:\/sbin\/mingetty tty1/co:2345:respawn:\/sbin\/agetty ttyS0 115200 vt100-nav/‘ /etc/inittab
 
sed -i ‘s/^HISTSIZE=.*$/HISTSIZE=100/‘ /etc/profile
 
# /etc/security/limits.conf
[ -z "`cat /etc/security/limits.conf | grep ‘nproc 65535‘`" ] && cat >> /etc/security/limits.conf < <EOF
* soft nproc 65535
* hard nproc 65535
* soft nofile 65535
* hard nofile 65535
EOF
[ -z "`cat /etc/rc.local | grep ‘ulimit -SH 65535‘`" ] && echo "ulimit -SH 65535" >> /etc/rc.local
 
[ -z "`cat ~/.bashrc | grep ^PS1`" ] && echo ‘PS1="\[\e[37;40m\][\[\e[32;40m\]\u\[\e[37;40m\]@\h \[\e[35;40m\]\W\[\e[0m\]]\\$ "‘ >> /root/.bashrc 
 
# /etc/sysctl.conf
sed -i ‘s/net.ipv4.tcp_syncookies.*$/net.ipv4.tcp_syncookies = 1/g‘ /etc/sysctl.conf
[ -z "`cat /etc/sysctl.conf | grep ‘fs.file-max‘`" ] && cat >> /etc/sysctl.conf < < EOF
fs.file-max=65535
net.ipv4.tcp_fin_timeout = 30 
net.ipv4.tcp_tw_reuse = 1
net.ipv4.tcp_tw_recycle = 1
net.ipv4.ip_local_port_range = 1024 65000
net.ipv4.tcp_max_syn_backlog = 262144
net.ipv4.tcp_max_tw_buckets = 6000
net.ipv4.route.gc_timeout = 100
net.ipv4.tcp_syn_retries = 1
net.ipv4.tcp_synack_retries = 1
net.core.somaxconn = 65535 
net.core.netdev_max_backlog = 262144
net.ipv4.tcp_timestamps = 0
net.ipv4.tcp_max_orphans = 262144
EOF
%end

關於配置裏面的root的密碼，首先看看python 的版本

[root@pandora qemu]# python -V
Python 2.7.5

python的版本大於2.7的，運行設置密碼

 python -c ‘import crypt,getpass; print(crypt.crypt(getpass.getpass(), crypt.mksalt(crypt.METHOD_SHA512)))‘

python的版本小於於2.7的，運行
 python -c ‘import crypt; print crypt.crypt("CLEARTEXTPASSWORD", "$6$saltsalt$")‘

當然，直接用腳本配置裏面的123@abc#的密碼也可以，安裝完後更改root密碼

接著用virt-install安裝虛擬機，就會自動按照centos7.ks.cfg的配置完成安裝

virt-install --accelerate --name=centos7-docker--hvm --virt-type kvm --boot hd --disk path=/home/storage/centos7-docker.qcow2,format=qcow2,size=300,sparse=true,cache=none,bus=scsi --network bridge:br0 --vcpus=8 --ram=8192 --os-type=linux --os-variant=rhel7 --graphics none --serial pty --console pty --location /home/iso/CentOS-7-x86_64-DVD-1511.iso --initrd-inject /home/iso/conf/base7.cfg --extra-args "inst.ks=file:/base7.cfg console=ttyS0"

kvm無人值守安裝centos 7虛擬機