Archive: 2019

2019
Linux

Create chroot jail with openssh

How to create a chroot jail with openssh (sftp only)This write up describes how to utilize openssh to setup a chroot jail for sftp connections within the CentOS family. I tried & tried to install

Linux

Create logical volume using lvm

This example uses a local hard disk to create a logical volume. partition the disk as normal using fdisk. I new the fdisk options ahead of time from having done this before. EDS etldev1 ~ # FDISK_C

Linux

Failed to activate lv

Failed to activate new LVEDS etlprod2 ~ # lvcreate -l 14645 -n lv_dwstore vg_etlprod2 Not activating vg_etlprod2/lv_dwstore since it does not pass activation filter. Failed to activate new LV. Resol

Linux

directory index full

How to handle “Directory index full” messages in syslogkernel: EXT3-fs warning (device dm-3): ext3_dx_add_entry: Directory index full! On systems in which this is being constantly logged to syslog, th

Linux

postfix masquerade

Setting relayhost in postfixThe relayhost parameter specifies the default host to send mail to. This is equivalent to the DS entry in sendmails MTA sendmail.cf config file. !!! note output below h

Linux

Extracting initrd

How to extract and view contents of initrdDepending on your version of linux, the /boot/initrd may be one of two formats: cpio archive ext2 filesystem data The easiest way to determine what you’re w

Linux

Redirecting stdout and stderr

How to redirect standard output and standard errorWe’ve seen the numbers used in redirecting stdout and stderr. So what do they mean? 1 represents standard output 2 represents standard error 2>

Linux

Setup Local Mirror of RHEL Repo

How To create your own local Red Hat Enterprise Linux yum repository serverTo begin, build a virutal machine or stand alone system installing the same OS version of Red Hat you wish to serve as the yu

Linux

Sorting IP Addresses via bash

Sort list of IP addresses via command lineDo you have a text file filled with a bunch of IP addresses, and it won’t sort properly with the -n option alone? Providing additional options can help achiv

Linux

How To Check If LFS is Enabled

To check if a file system supports the LFS (Large File System) standard, you can use the getconf command. If the result is 64, LFS is supported. getconf FILESIZEBITS / In the example above, the root