Create SSH user without password using PuttyGen

Create SSH User
[root@localhost ~]# useradd test
[root@localhost ~]# passwd test

 Create Keypair using PyttyGen

 
 Copy Public key and paste into authorized_keys file

[root@localhost test]# mkdir /home/test/.ssh
[root@localhost .ssh]# vi /home/test/.ssh/authorized_keys
Paste the Public key

[root@localhost home]# chown test:test -R test/.ssh/

Save Private key

Using putty to connect Server

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CLEANING UP THE ZABBIX DATABASE

My Zabbix database size increased a lot in the last few months and since my disk was running out space, I decided to clean up the old events from the database. Looking at the database tables, the biggest one was  history_uint , which holds the items history data – over 400 millions of records and over 30 Gb of disk space before the clean up. Since deleting the old records from this table directly would be a very slow process, I decided to create a new table and insert the latest records from the  history_uint  table and then just replace the old table with a new one. Since this is not an offical procedure, use it at your own risk. Environment: Zabbix v2.2 MySql 5.1 – InnoDB with  innodb_file_per_table=ON Step 1 – Stop the Zabbix server Step 2 – Open your favourite MySQL client and create a new table CREATE TABLE  history_uint_new  LIKE  history_uint; Step 3 – Insert the latest records from the  history_uint  table to the...
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Configuring DHCP Relay service on the FortiGate unit

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[Resolved] Amazon EC2 Redhat 7 using 6GB for the root space

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I create new server with 10GB of HDD, but when i check on the command line, the root space only show 6GB. I'm using t2.micto and Redhat 7.0, disk type: XFS. - xvda1: boot partition - xvda2: root partition Fix Step: We have instance A with the volume VA. 1) Stop the current instace A 2) Snapshot the current volume VA of the instance A 3) Start the instance A 4) Create new volume with 25GB by using the snapshot of volume VA then we have new volume VB 5) Attach the new volume VB to the instance A as default (/dev/sdf) 6) From the ssh console, i use the lsblk command to list the disk. # lsblk 7) Using the xfs_repair to repair the /dev/xvdf2 ( yum install xfsprogs) # xfs_repair /dev/xvdf2 8) Continue as the image below 9) Remove the /dev/xvdf2, remember the start of this disk then we will create the new one with the same. 10) Using XFS command to repair the /dev/xvdf2 again. # xfs_repair /dev/xvdf2 11) Use the lsblk co...
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