Linux - Revision history

Leaky: /* Mount .img in directory */

2017-08-27T15:55:36Z

‎Mount .img in directory

2016-06-21T10:56:24Z

‎Mount .img in directory

2016-06-21T10:56:07Z

Added loopback mounting of disk images

2014-12-31T20:57:08Z

‎Features

2014-12-03T14:35:25Z

Added process id limits

2014-08-24T20:26:44Z

2014-07-30T20:38:12Z

2014-07-30T20:37:41Z

moved Linux to CentOS6: More relevant to CentOS 6 as there's a separate C7 page

New page

#REDIRECT [[CentOS6]]

← Older revision		Revision as of 15:55, 27 August 2017
Line 65:		Line 65:
	/dev/loop0		/dev/loop0
	# mount -t ext3 /dev/loop0 /mnt		# mount -t ext3 /dev/loop0 /mnt
		+
		+	== Package repositories ==
		+
		+	If you need something more up to date than the standard CentOS packages, check [https://fedoraproject.org/wiki/EPEL EPEL] (Extra Packages for Enterprise Linux) or [https://ius.io/GettingStarted/ IUS] (Inline with Upstream Stable).
		+
		+	* PHP 7 - IUS
		+	* git 2.x - IUS
		+	* Nagios - EPEL
		+	* Perl modules installed for system Perl - EPEL
		+
		+	With CentOS, the EPEL repository can be enabled with <code><nowiki>yum install epel-release</nowiki></code> but RHEL users need to download the rpm from the main EPEL webpage.
		+
		+	IUS package urls to install the repository
		+
		+	* https://rhel6.iuscommunity.org/ius-release.rpm
		+	* https://rhel7.iuscommunity.org/ius-release.rpm
		+	* https://centos6.iuscommunity.org/ius-release.rpm
		+	* https://centos7.iuscommunity.org/ius-release.rpm
		+
		+	These can be installed with <code><nowiki>yum install $url</nowiki></code>

@@ Line 45: / Line 45: @@
   # fdisk -l /dev/loop0
-−
   Disk /dev/loop0: 4022 MB, 4022337024 bytes, 7856127 sectors
   Units = sectors of 1 * 512 = 512 bytes

← Older revision		Revision as of 10:56, 21 June 2016
Line 33:		Line 33:

	cPanel sets it to 1048576 by default.		cPanel sets it to 1048576 by default.
		+
		+	== Mount .img in directory ==
		+
		+	To mount a disk image in a directory.
		+
		+	# losetup -v --show -f /path/to/disk.img
		+	/dev/loop0
		+	# mount -t ext3 /dev/loop0 /mnt
		+
		+	If disk.img is an image of the entire disk, not just a filesystem, you can specify
		+
		+	# fdisk -l /dev/loop0
		+
		+	Disk /dev/loop0: 4022 MB, 4022337024 bytes, 7856127 sectors
		+	Units = sectors of 1 * 512 = 512 bytes
		+	Sector size (logical/physical): 512 bytes / 512 bytes
		+	I/O size (minimum/optimal): 512 bytes / 512 bytes
		+	Disk label type: dos
		+	Disk identifier: 0x00000000
		+
		+	Device Boot Start End Blocks Id System
		+	/dev/loop0p1 62 7849447 3924693 83 Linux
		+
		+	This gives the start byte count (62 * 512 = 31744) to use. Remove the original loopback device (-d)
		+
		+	# losetup -d /dev/loop0
		+
		+	Add the new loopback device but specify the offset into the file as 31744 bytes.
		+
		+	# losetup -v --show -f -o 31744 /path/to/disk.img
		+	/dev/loop0
		+	# mount -t ext3 /dev/loop0 /mnt

@@ Line 9: / Line 9: @@
 * [[LVM]]
 * [[Nginx]]
 == CentOS - max pids ==

← Older revision		Revision as of 14:35, 3 December 2014
Line 9:		Line 9:
	* [[LVM]]		* [[LVM]]
	* [[Nginx]]		* [[Nginx]]
		+
		+	== CentOS - max pids ==
		+
		+	To view the current maximum number
		+
		+	$ cat /proc/sys/kernel/pid_max
		+	32768
		+
		+	To increase the maximum number of processes, you can use sysctl for a temporary or permanent change.
		+
		+	Temporarily update it (until next reboot):
		+
		+	# sysctl -w kernel.pid_max=1048576
		+
		+	or a permanent change:
		+
		+	# echo "kernel.pid_max = 1048576" >> /etc/sysctl.conf
		+	# sysctl -p
		+
		+	cPanel sets it to 1048576 by default.