Here's an interesting problem I just finished working on. I figured I would share it with the Atlassian community.
(1) After upgrading a legacy server from postgresql server 9.1 to 9.4, everything worked, psql was upgraded and all was fine with the world.
(2) ...Except the backups which had been failing. The pg_dump utility was failing to dump the database because of a version mismatch similar to the error below:
pg_dump: server version: 9.4.4; pg_dump version: 9.1.6 pg_dump: aborting because of server version mismatch
Here was the solution...
A little investigation showed the following to be true:
root@serverNameRedacted:/usr/lib/postgresql# psql --version psql (PostgreSQL) 9.4.4 root@serverNameRedacted:/usr/lib/postgresql# pg_dump --version pg_dump (PostgreSQL) 9.1.6 root@serverNameRedacted:/usr/lib/postgresql# which pg_dump /usr/bin/pg_dump root@serverNameRedacted:/usr/lib/postgresql# ls -la /usr/bin/pg_dump lrwxrwxrwx 1 root root 37 Jun 4 10:13 /usr/bin/pg_dump -> ../share/postgresql-common/pg_wrapper root@serverNameRedacted:/usr/lib/postgresql# dpkg -l | grep postgres ii pgdg-keyring 2014.1 keyring for apt.postgresql.org rc postgresql-9.1 9.1.18-0ubuntu0.12.04 object-relational SQL database, version 9.1 server ii postgresql-9.3 9.3.9-1.pgdg12.4+1 object-relational SQL database, version 9.3 server rc postgresql-9.4 9.4.4-1.pgdg12.4+1 object-relational SQL database, version 9.4 server ii postgresql-client-9.1 9.1.6-0ubuntu0.12.04 front-end programs for PostgreSQL 9.1 ii postgresql-client-9.3 9.3.9-1.pgdg12.4+1 front-end programs for PostgreSQL 9.3 ii postgresql-client-9.4 9.4.4-1.pgdg12.4+1 front-end programs for PostgreSQL 9.4 ii postgresql-client-common 169.pgdg12.4+1 manager for multiple PostgreSQL client versions ii postgresql-common 169.pgdg12.4+1 PostgreSQL database-cluster manager ii postgresql-contrib-9.3 9.3.9-1.pgdg12.4+1 additional facilities for PostgreSQL
I do know that the postgres 9.4 utilities are installed...
root@serverNameRedacted:/usr/lib/postgresql# ls -la /usr/lib/postgresql/9.4/bin/ total 1896 drwxr-xr-x 2 root root 4096 Sep 5 14:07 . drwxr-xr-x 3 root root 4096 Sep 5 14:07 .. -rwxr-xr-x 1 root root 68088 Jun 10 12:32 clusterdb -rwxr-xr-x 1 root root 68152 Jun 10 12:32 createdb -rwxr-xr-x 1 root root 63872 Jun 10 12:32 createlang -rwxr-xr-x 1 root root 68536 Jun 10 12:32 createuser -rwxr-xr-x 1 root root 63896 Jun 10 12:32 dropdb -rwxr-xr-x 1 root root 63872 Jun 10 12:32 droplang -rwxr-xr-x 1 root root 63864 Jun 10 12:32 dropuser -rwxr-xr-x 1 root root 68424 Jun 10 12:32 pg_basebackup -rwxr-xr-x 1 root root 351864 Jun 10 12:32 pg_dump -rwxr-xr-x 1 root root 89304 Jun 10 12:32 pg_dumpall -rwxr-xr-x 1 root root 30944 Jun 10 12:32 pg_isready -rwxr-xr-x 1 root root 47560 Jun 10 12:32 pg_receivexlog -rwxr-xr-x 1 root root 51944 Jun 10 12:32 pg_recvlogical -rwxr-xr-x 1 root root 154904 Jun 10 12:32 pg_restore -rwxr-xr-x 1 root root 519376 Jun 10 12:32 psql -rwxr-xr-x 1 root root 68120 Jun 10 12:32 reindexdb -rwxr-xr-x 1 root root 68248 Jun 10 12:32 vacuumdb
I could change the symlink to the 9.4 version (as suggested on stackoverflow. see http://stackoverflow.com/questions/12836312/postgresql-9-2-pg-dump-version-mismatch):
sudo ln -s /usr/lib/postgresql/9.3/bin/pg_dump /usr/bin/pg_dump --force
But if you don't need the older version (9.1) for migration or what not it would be better to just remove the old software:
apt-get remove postgresl-client-9.1 apt-get install postgresql-client-9.4
Depending on the mission-specific needs, the end result is the same:
root@serverNameRedacted:/usr/lib/postgresql# pg_dump --version pg_dump (PostgreSQL) 9.4.4
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