How to change HELO hostname
EHLO (or HELO) identifies a host at the start of an SMTP protocol connection. In zimbra, you can change the EHLO (or HELO) sent to other smtp servers and set the greeting banner.
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392 notes on Linux, tools and troubleshooting
How to change a network interface name on CentOS/RHEL 7
Linux network interfaces are commonly named eth0, eth1, ... ethx. These names do not describe the interface hardware, so they do not tell us what kind of hardware eth0 or eth1 is…
SysVinit and systemd command comparison table
RHEL 7 changes its service manager from SysVinit to systemd, offering parallel operation, mount point handling, and cgroups support. These tables compare their commands.
Where to find OpenStack Cloud Images
A collection of OpenStack cloud images for various distributions, for creating images in Glance. CirrOS is a small Linux cloud image for testing instance creation.
How to fix yum return Segmentation fault error
On CentOS 5, yum may return a Segmentation fault error, for example: [root@ezylinux ~]# yum update bash. base | 1.1 kB 00:00…
How to convert string to lower case
There are several ways to convert uppercase strings to lowercase in Bash: tr, awk, Bash 4.0 expansion, or Perl.
How to change an iDRAC password using Racadm
Reset an iDRAC password directly from the server through OpenManage using racadm. Install OpenManage before following these steps.
How to fix bind hangs on generating rndc key
After setting up a DNS server, starting the named service may hang at Generating /etc/rndc.key:, as shown: [root@zm named]# /etc/init.d/named restart. Stopping named…
How to fix "SSL_connect ... certificate verify failed" on puppet client
After installing the Puppet client, # puppet agent --test connects to the Puppet master but may produce: err: Could not retrieve catalog from remote server: SSL…