Linux

How to Resolve Crontab Error crontab: installing new crontab "/tmp/crontab":1: bad command errors in crontab file, can't install.

by Ed Chen
October 24, 2015November 22, 2022
2 Comments

crontab: installing new crontab When I tried to save and quit editing crontab, I met an error like this: [oracle@test ~]$ crontab -e crontab: installing… Read More »

How to Build SSH Equivalency Between Two Servers

by Ed Chen
September 3, 2015February 13, 2023

In this post, we will introduce two kinds of ways to build user's SSH equivalency. Both methods are good. Manual establishing can make your know… Read More »

How To Bind Multiple IP Addresses to One Network Interface on Enterprise Linux 7

by Ed Chen
August 18, 2015March 30, 2018

Here are the steps that you can add more IP address into the network card.Copy the configuration file of eth0 as eth0:0[root@test ~]# cp -p… Read More »

How to Sync Time Server Manaully

by Ed Chen
August 17, 2015March 30, 2018

After starting the server, I found that the date time a little bit deviated from the time server.[root@primary01 ~]# ntpq -p remote … Read More »

How to Make Forwarders of BIND Named Server Work

by Ed Chen
August 16, 2015March 27, 2022

Your DNS might not cache all the records of internet, but you can forward the query to external DNS for servicing your clients.There're two entries… Read More »

How to Increase SWAP Partition on Linux

by Ed Chen
August 12, 2015May 17, 2023

Let's see the current size of SWAP. [root@test ~]# cat /proc/swaps Filename … Read More »

How to Reduce Logical Volume Size on Linux

by Ed Chen
August 11, 2015November 22, 2022

Since I found there's no free space in the main volume group for extending other volumes, so I intend to shrink some non-critical volumes to… Read More »

How to Increase Logical Volume Size on Linux

by Ed Chen
August 10, 2015November 22, 2022

Logical volumes (LV) are controlled by the belonging volume group (VG), so there must have some free space in the VG for LVs to increase.… Read More »

How to Increase Volume Group Size on Linux

by Ed Chen
August 9, 2015November 22, 2022

When we have space pressure on logical volumes (LV), we will seek for free space (or you may say unused space) in volume groups (VG)… Read More »

How to Resolve PartProbe Error: "WARNING: the kernel failed to re-read the partition table on /dev/sda"

by Ed Chen
August 8, 2015November 22, 2022
2 Comments

In general, the newly created partition, i.e. /dev/sda3 in this case does not show in the device directory immediately and automatically.[root@test ~]# ll /dev/sd*brw-rw----. 1… Read More »

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