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0830

make a clean vm template

find /var/log -type f | xargs rm -rf
rm -rf /etc/ssh/ssh_host_*

nmtui

dnf install chrony
systemctl enable chronyd

dnf install qemu-guest-agent

rm -rf ~/.bash_history
history -c
HISTSIZE=0

setup chrony

$ vi /etc/chrony.conf
# pool 2.centos.ntp.org iburst
server 192.168.1.0 iburst

# 白名單
allow 192.168.0.0/16

shell script tutorial

$ mkdir shell

$ cd shell

$ ping -c 3 168.95.192.1

# 確認執行成功
$ echo $?
0

$ ping -c 3 168.95.193.1

# 確認執行失敗
$ echo $?
1

$ vi ping-test.sh

$ chmod u+x ping-test.sh

$ ./ping-test.sh 168.95.192.1

$ sh -x ping-test.sh 168.95.192.1

$ echo $PATH

$ which sh

ping-test.sh

#!/bin/bash

export PATH=/bin:/sbin:/usr/bin:/usr/sbin:/usr/local/bin:/usr/local/sbin

ip=${1}

ping -c 3 ${ip} &> /dev/null

if [ $? -eq 0 ]
then
    echo ok
else
    echo fail
fi

oVirt REST API

$ curl http://ovirt-64.linux.class/ovirt-engine/api/vms

$ curl -k -u 'admin@internal:centos' https://ovirt-64.linux.class/ovirt-engine/api/vms

# -v 顯示 debug 訊息
# -s 不顯示進度條
# -k 不驗證 ssl
# -u user 帳密
# -F split 的分隔符號 (awk)
$ curl -s -k -u 'admin@internal:centos' https://ovirt-64.linux.class/ovirt-engine/api/vms | grep '<vm href=' | awk '{print $2}' | awk -F '"' '{print $2}'

# -X HTTP methods
# -H request header
# -d request body
$ curl -k -u 'admin@internal:centos' https://ovirt-64.linux.class/ovirt-engine/api/vms/{vm:id}/start -X POST -H 'Accept:application/xml' -H 'Content-type:application/xml' -d '<action/>'

$ vi operate-all-vm.sh

$ vi list

$ sh operate-all-vm.sh reboot

$ sh operate-all-vm.sh shutdown

$ sh operate-all-vm.sh start

$ sh operate-all-vm.sh stop

$ sh operate-all-vm.sh suspend

operate-all-vm.sh

#!/bin/bash
export PATH=/bin:/sbin:/usr/bin:/usr/sbin:/usr/local/bin:/usr/local/sbin

action=${1}

url=https://ovirt-64.linux.class/ovirt-engine/api

for vm_id in $(cat list)
do
curl -k -u 'admin@internal:centos' ${url}/vms/${vm_id}/${action} \
    -X POST \
    -H 'Accept:application/xml' \
    -H 'Content-type:application/xml' \
    -d '<action/>'
done