Create a script clear_exim
# vi clear_exim
Insert:
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Install ClamAV 99.2 for RHEL7-CentOS6
1 – Install EPEL 7
RHEL7:
# wget http://dl.fedoraproject.org/pub/epel/7/x86_64/e/epel-release-7-9.noarch.rpm
# rpm -Uvh epel-release*.rpm
CentOS 7:
# yum install epel-release
Configuring a user in vsftpd
Add your system user
Yes, it is this simple, creating a new user for ftp access in vsftpd is as easy as creating a new valid linux system user.
useradd test
passwd test
Rsync Command Example
This is an example for copying data from a local server to a remote server (push).
# cd / (starting directory)
# rysnc -avhP local_directory user@1.1.1.1:/remote_directory
-a = archive mode; equals -rlptgoD
-v = verbose
-h = human readable
-P = show progress
How to reload sysctl.conf
On FreeBSD:
# sudo /etc/rc.d/sysctl reloadOn Linux:
# sudo sysctl -p /etc/sysctl.confHow To Create a File with Random Zeros and Ones
Here is how to create a file with random 1s and 0s.
Example 1GB File:
dd if=/dev/urandom of=test1 bs=1M count=1024Example 10GB File:
dd if=/dev/urandom of=test1 bs=1M count=10240FSCK from Linux Rescue Mode
1. Boot server/VM in BIOS mode and change Boot Mode to CD
2. Boot server/VM from Linux CD
3. Hit F5 to enter Rescue Mode.
How to Reset root Password Linux Server in Rescue Mode
1. Boot server/VM in BIOS mode and change Boot Mode to CD
2. Boot server/VM from Linux CD
3. Hit F5 to enter Rescue Mode.
Disable NetworkManager on Redhat 6.x
The Network Manager service is currently enabled by default on Red Hat Enterprise Linux installations where one of these package groups was selected during installation:
Desktop
NM_CONTROLLED will be installed so that your network interface be managed the NetworkManager daemon. This means the traditional means of managing your network interfaces via the /etc/sysconfig/network-scripts/ifcfg-ethX files will no longer work. Thus, our problem.
Why Postfix deliver mails locally instead of relaying
This only works if mydomain.com is not the domain configured in Postfix. Because Postfix thinks everything is local when you configured it to be local.
To fix this problem modify Postfix main.cf file:
mydestination = localhost.localdomain, localhost
fallback_transport = relay
