===== Linux General =====
{{tag>Linux}}

Exit Red Hat Graphical Boot (boot splash screen) in a vm:\\
CRTL + END

\\

Remove files after "k" number of days
<code>
find /PATH/TO/FILES/* -mtime +$k -exec rm -rf {} \;
</code>

\\

====RHEL / CentOS 7 System Control====
<file>
systemctl -a | grep -i servicename
systemctl status servicename
systemctl start servicename
</file>

\\

====IPTables====

The following will;
  * List the rules
  * Add a new rule at line 4
  * List the rules
  * Save the rules
  * List the file saving the rules

<file>
sudo iptables -L -n --line-numbers
sudo iptables -I INPUT 4 -p tcp -m state --state NEW -m tcp --dport 3306 -j ACCEPT
sudo iptables -L -n --line-numbers
sudo service iptables save
sudo cat /etc/sysconfig/iptables
</file>

\\

====iSCSI====

Server 1 Target 1

<file>

[root@server1]# cat /etc/tgt/targets.conf
<target iqn.2010-10.net.company:server1.target1>
 backing-store /dev/sdb
 vendor_id     COMPANY
 scsi_id       server1tgt1
 scsi_sn       0101
</target>

</file>

Server 2 Target 1

<file>

[root@server2]# cat /etc/tgt/targets.conf
<target iqn.2010-10.net.company:server2.target1>
 backing-store /dev/sdb
 vendor_id     COMPANY
 scsi_id       server2tgt1
 scsi_sn       0201
</target>

</file>

==== Repositories ====

http://fedoraproject.org/wiki/EPEL

https://forensics.cert.org

http://rpms.famillecollet.com

==== OpenSSH ====

<file>
ssh -oKexAlgorithms=+diffie-hellman-group1-sha1 user@legacyhost
</file>

https://www.openssh.com/legacy.html