问题
This is driving me nuts
First, my hosting provider that I have been with since the stone age, are dragging their feet about updating to Centos 6 and, from what I have read, I can see why.
Instead of waiting for the next ice age to pass, I read the instructions for just updating postgresql 9.2 on Centos 5, which is all I need to run my bundle install, which tells me that my PostgreSQL is too old - PostgreSQL 8.1.23
After updating and starting, here's the message back:
[root@vps data]# /etc/init.d/postgresql-9.2 start
/etc/rc.d/init.d/functions: fork: Cannot allocate memory
/etc/profile.d/lang.sh: line 53: /sbin/consoletype: Argument list too long
Starting postgresql-9.2 service: [ OK ]
It started, great - right?
No,
[root@vps data]# psql --version
psql (PostgreSQL) 8.1.23
contains support for command-line editing
If 9.2 started, then why does it still say 8.1.23?
Maybe I just need to reboot
reboot -i
ssh back in psql --version still shows PostgreSQL 8.1.23 - WTF?
I run /etc/init.d/postgresql-9.2 start - it starts - OK, cool
bundle install
Make sure that `gem install pg -v '0.17.1'` succeeds before bundling
gem install pg -v '0.17.1'
I still receive the error:
checking for PQconnectionUsedPassword()... no
Your PostgreSQL is too old. Either install an older version of this gem or upgrade your database.
*** extconf.rb failed ***
So, my ultimate questions are:
If the postgresql 9.2 started, why does it say that I am running 8.1.23?
Do I have to rm -rf the entire /usr/bin/psql and start over?
回答1:
The PostgreSQL Development Group has packages for Pg 9.3 on CentOS 5.
See yum.postgresql.org.
However, installing Pg 9.3 won't remove 8.1. It'll still be on your PATH. It'll still be running, too.
If you want to use the 9.3 psql and libpq, you need to alter your PATH and LD_LIBRARY_PATH to prefer the PostgreSQL 9.3 install. Then rebuild the Pg gem against the new libpq.
Something like:
export PATH="/usr/pgsql-9.3/bin:$PATH"
export LD_LIBRARY_PATH="/usr/pgsql-9.3/lib/:$LD_LIBRARY_PATH"
gem uninstall pg
gem install pg
If you want this to take effect globally you can modify /etc/ld.so.conf to put the new path in place by default, and /etc/environment to set the PATH appropriately.
Otherwise, add the first two lines to your ~/.bash_profile.
Separately, these are rather worrying:
/etc/rc.d/init.d/functions: fork: Cannot allocate memory
/etc/profile.d/lang.sh: line 53: /sbin/consoletype: Argument list too long
as they suggest something is mismatched/broken on the system. Not necessarily PostgreSQL related. Have you force-installed any RPMs or used any 3rd party repos?
来源：https://stackoverflow.com/questions/22626366/postgresql-9-2-on-centos-5-rails-bundle-postgresql-is-too-old