dungmanh88’s gists

dungmanh88 / Utilities package

Last active October 2, 2016 16:24

Utilities package

	yum clean all
	yum -y install epel-release
	yum -y groupinstall "Development tools"
	yum -y install iftop iptraf nethogs ncdu git atop htop iotop smartmontools dmidecode sysbench siege fio lshw ioping vim tmux telnet ntp chrony openssl-devel zlib-devel python-devel pciutils net-tools

dungmanh88 / Get unallocated space

Last active October 1, 2016 15:21

Get unallocated space

	[root@test home]# parted
	GNU Parted 2.1
	Using /dev/sda
	Welcome to GNU Parted! Type 'help' to view a list of commands.
	(parted) print free
	Model: VMware Virtual disk (scsi)
	Disk /dev/sda: 32,2GB
	Sector size (logical/physical): 512B/512B
	Partition Table: msdos

dungmanh88 / Best practice for mount -t xfs

Created October 1, 2016 15:14

Best practice for mount -t xfs

mount -t xfs -o inode64,noatime /dev/sda6 /data/glusterfs/volname/brick1/

dungmanh88 / Recovery bad super block

Created October 1, 2016 15:14

Recovery bad super block

	Umount /dev/sda1
	fsck -V /dev/sda1 to get the location of bad super block
	mke2fs -n /dev/sda1 to get the location of backup super block
	e2fsck -b <the location of backup super block in output of mke2fs -n> /dev/sda1 to replace bad super block

dungmanh88 / Create and use loop device

Created October 1, 2016 15:09

Create and use loop device

	dd if=/dev/zero of=/virtual_drive bs=1G count=1
	mkfs -t ext4 /virtual_drive
	mkdir -p /mnt/virtual_device
	mount -t ext4 -o loop /virtual_drive /mnt/virtual_device

	To view loop device list:
	losetup -a

dungmanh88 / Update docker.service

Created September 30, 2016 08:23

Update docker.service

	vi /usr/lib/systemd/system/docker.service
	ExecStart=/usr/bin/docker daemon -H tcp://0.0.0.0:2375 -H unix:///var/run/docker.sock -H fd://

	systemctl daemon-reload

	systemctl show docker \| grep -i exec
	ExecStart={ path=/usr/bin/docker ; argv[]=/usr/bin/docker daemon -H tcp://0.0.0.0:2375 -H unix:///var/run/docker.sock -H fd://

	systemctl restart docker.service

dungmanh88 / Install latest docker engine

Last active September 30, 2016 04:19

Install latest docker engine

yum -y update && curl -fsSL https://get.docker.com/ | sh && systemctl start docker && docker run hello-world

dungmanh88 / Install docker-engine 1.11.2

Last active September 30, 2016 04:19

Install docker-engine 1.11.2

	sudo tee /etc/yum.repos.d/docker.repo <<-'EOF'
	[dockerrepo]
	name=Docker Repository
	baseurl=https://yum.dockerproject.org/repo/main/centos/7/
	enabled=1
	gpgcheck=1
	gpgkey=https://yum.dockerproject.org/gpg
	EOF

	yum -y update && yum -y install docker-engine-1.11.2 && systemctl start docker && docker run hello-world

dungmanh88 / 1 - Backup using percona xtrabackup

Last active October 1, 2016 13:16

Local backup using percona xtrabackup

	sudo vi /usr/local/bin/mysql_backup
	#!/bin/bash

	user_name=root
	user_password="<pass>"
	backup_name=<backup_name>
	host="127.0.0.1"
	parallel=4
	backup_output="/data/local-backup"
	temp_log="/var/log/mysql_backup.log.tmp"

dungmanh88 / Create sudo user with passwordless

Last active September 28, 2016 09:27

Create sudo user with passwordless

	useradd test
	groupadd sudo_passwdless
	gpasswd -a test sudo_passwdless

	groups test
	test : test sudo_passwdless

	vi /etc/sudoers
	%sudo_passwdless ALL=(ALL) NOPASSWD: ALL