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Using mod_proxy to avoid DNS propagation during site migration

There are a number of ways to migrate a site to a new server, whilst avoiding downtime or data concurrency issues. For a highly dynamic site, generally I would edit the old and new site connection strings to both use the same database during switchover.  mod_proxy is a useful method perhaps if a new version […]

Plesk 9 – Migration Manager set source directory

For some bizarre reason The Plesk 9 migration manager has taken away the functionality to specify the partition used on the source server.  Not very handy if you have partitions running low on disk space.  I’ve found two solutions that seem to work: On the target server edit /usr/local/psa/admin/share/migration-handler/ Modify the following line and update […]

Gluster active/passive cluster

Gluster is a nice distributed file system which offers some management benefits over block level storage systems like DRBD. By design Gluster works in an active/active cluster configuration, however for applications where millisecond precision data replication is essential, an active/passive configuration is preferable. This is how (based on SLES11 with HAE): usual SLES HA cluster […]

Load Balanced Linux Web Cluster

Another example of a load balanced apache cluster, this time active-active using Pacemaker/Corosync/ldirectord. This example is using CentOS. – fixed IP of server1 – fixed IP of server 2 – apache site 1 (virtual IP) – apache site 1 server 1 – apache site 1 server 2 – apache […]

Plesk 9 Backup Utility Broken

After an upgrade to Plesk 9 you cannot schedule backups and get the following error: Unable to update scheduled backup information: MySQL query failed: Unknown column ‘backup_time’ in ‘field list’ Just run the following and it will reinstall them and correct the database: yum erase psa-backup-manager psa-migration-manager yum install psa-backup-manager psa-migration-manager service psa restart