Strav's blog

Category: "Ubuntu"

Server migration Ubuntu 12.04 -> Centos 7

August 30th, 2018

I'm in the process of migrating from Ubuntu 12.04 to Centos 7. I'm going to document links and as much as I can of the process here.

I've been running this server for over 12 years at this point. It's been through multiple upgrades and the last was quite some time ago. Ubuntu 18 is out at this point so the existing software base is quite dated.

Mysql has been replaced by MariaDB which is a free fork. Again, not too big a deal but there are some hurdles like a change to the password encryption. The mysql client connects fine but php applications can't connect until the password has been re-encrypted.

Export/Import Links
Export and Import all MySQL databases at one time

Miscellaneous Links
MySQL error 2006: mysql server has gone away
mysql sql command to change a user password
Changing MariaDB passwords
Changing the Time Zone in MySQL

Postgres information
Postgres is failing with 'could not open relation mapping file “global/pg_filenode.map”'

Apache is changing from version 2.2 to version 2.4. Overall this is not too big a deal, but they did make a significant change to the Authorization syntax

How To Migrate your Apache Configuration from 2.2 to 2.4 Syntax
script to migrate apache 2.2 to 2.4 configuration files

2.2 configuration:
Order deny,allow
Deny from all

2.4 configuration:
Require all denied

2.2 configuration:
Order allow,deny
Allow from all

2.4 configuration:
Require all granted

Access Control

SSL Certificates with Apache on CentOS 7

Mail configuration and migration has been one of the most difficult parts. The old server used postfix, procmail and cyrus. I'm going with postfix, sieve and dovecot for the new server. Dovecot appears to be a more standardized IMAP server. I had nothing but trouble trying to get postfix set up so looked into sieve. Sieve will allow for user side rule management and the server side seems to be much simpler syntax.

Mail

Postfix
Postfix error: private/smtp No such file or directory
Postfix TLS Support
Postfix status=deferred (mail transport unavailable)
connect #n to subsystem private/proxymap: Connection refused
Mail filtering with procmail in a postfix/dovecot system with virtual users
Postfix and TLS encryption
Postfix unable to receive mail
antispam techniques in postfix on linux

Dovecot
Dovecot installation and configuration on CentOS
Dovecot Mail Location
Dovecot Virtual Users
Dovecot Virtual Users / Home
Migrating from any IMAP/POP3 server to Dovecot via dsync
Migration to Dovecot

Roundcube Mail - Finally!!!
Custom Roundcube Install Centos 7
How to install Roundcube
Install latest version of Roundcube (Webmail) on CentOS 7
Roundcube configuration options

Sieve
sieve filter not working
Sieve Syntax and Common Recipes
Pigeonhole Sieve Configuration

Amavis / ClamAV / SpamAssassin
Fighting Spam/Viruses with Amavisd-New, Maia and Postfix
amavis + SA not marking messages as spam
PostfixAmavisNew
amavisd-new
Integrating SpamAssassin with Postfix
Configure Postfix to use Spamassassin as a filter
SpamAssassin with dovecot-antispam training
Can't receive mail with dovecot + postfix setup
What to do with SpamAssassin after installing Amavis?
Postfix + Clamav + Amavisd
Amavisd-new, ClamAV and SpamAssassin
Amavis / spamassassin setup, how to disable quarantine and get default spamassassin behavior back?
Mail Filtering
Handling Spam with Postfix, SpamAssassin, Dovecot and Sieve.
How to move spam to spam folder?