Linux – IT Blog

iRedMail. Change password complexity

I will give an example of changing the requirements for password complexity in iRedAdmin, they are used to check the entered password, for example, when creating a user or simply changing a password for a user. However, I do not recommend downgrading them.

Configuring RPS (Receive Packet Steering)

Receive Packet Steering (RPS) is a software implementation of RSS. Useful for example when there are fewer interrupts on the network interface than the processor cores.

Solution for ImportError: No module named web

Once I needed to disable the Nginx web server on the same server with iRedmail and install Apache2. And when I tried to start iRedadmin, it did not open, and in the Apache2 logs I saw:

iRedMail. Adding a catch-all account

One customer once asked to set up a forwarding of all email from non-existent addresses in his domain to a specific email address, this is usually called catch-all or luser_relay in postfix.

How to add Alias to iRedMail

Once, on the same mail server with iRedMail, I needed to redirect mail from the old domain to the new one, so I decided to add an alias so as not to lose contact with clients who will write to the email addresses of the old domain.

Configuring FTPS in ProFTPd

I will give an example of configuring FTPS in ProFTP, and prohibit simple connections without encryption.

Firmware Update HP 544+QSFP (764284-B21) Mellanox ConnectX-3 Pro EN

I once updated the driver for the Mellanox ConnectX-3 Pro EN / HP 544+ QSFP (764284-B21) network adapter and decided to update the firmware at the same time.

How to update the Mellanox ConnectX driver

For example, I will update the driver for the Mellanox ConnectX-3 Pro EN / HP 544+ QSFP (764284-B21) network adapter that I installed in the HPE DL380 Gen10 server with Ubuntu Server 18.04.

Replacing a word in Linux files

Once, when replacing the network adapter in the server, I needed to change its old name in the netplan configuration, that is, replace several hundred words in the file, so I came up with the command:

Solution “mod_auth_file/1.0: unable to use world-readable AuthUserFile /etc/proftpd/ftpd.passwd”

Once when running proftpd with configured users in a file, I noticed the following error: