[Koha-bugs] [Bug 22217] New: error "Connection to the memcached servers '__MEMCACHED_SERVERS__' failed" during install

[bugzilla-daemon at bugs.koha-community.org]

https://bugs.koha-community.org/bugzilla3/show_bug.cgi?id=22217

            Bug ID: 22217
           Summary: error "Connection to the memcached servers
                    '__MEMCACHED_SERVERS__' failed" during install
 Change sponsored?: ---
           Product: Koha
           Version: 18.11
          Hardware: PC
                OS: Linux
            Status: NEW
          Severity: normal
          Priority: P5 - low
         Component: Installation and upgrade (command-line installer)
          Assignee: koha-bugs at lists.koha-community.org
          Reporter: giuseppe.ciaccio at unige.it
        QA Contact: testopia at bugs.koha-community.org
  Target Milestone: ---

I'm trying to install Koha on a fresh Debian 9.7 32-bit, following the
instructions at https://wiki.koha-community.org/wiki/Koha_on_Debian  .  I work
as root so I have all privileges.

One of the installation steps consists of editing file
/etc/koha/koha-sites.conf .  Inside koha-sites.con, I find the following row:

USE_MEMCACHED="yes"

1.1) start memcached in the localhost
(this action is not reported in the instructions but is needed):

root at myhost:~# service memcached start

1.2) ensure that memcached is indeed active and listening at port 11211

root at myhost:~# ps ax
  PID TTY      STAT   TIME COMMAND
...
16908 ?        S      0:00 /usr/sbin/apache2 -k start
16909 ?        S      0:00 /usr/sbin/apache2 -k start
16910 ?        S      0:00 /usr/sbin/apache2 -k start
16920 ?        Ssl    0:00 /usr/bin/memcached -m 64 -p 11211 -u memcache -l
127.
...

1.3) proceed with install procedure, get worrying error messages

root at myhost:~# koha-create --create-db mylibrary

Koha instance is empty, no staff user created.
[ ok ] Starting Koha indexing daemon for mylibrary:.

root at myhost:~# koha-translate --install it-IT

Connection to the memcached servers '__MEMCACHED_SERVERS__' failed. Are the
unix socket permissions set properly? Is the host reachable?
If you ignore this warning, you will face performance issues

Connection to the memcached servers '__MEMCACHED_SERVERS__' failed. Are the
unix socket permissions set properly? Is the host reachable?
If you ignore this warning, you will face performance issues
Use of uninitialized value $pref_name in concatenation (.) or string at
/usr/share/koha/misc/translator/LangInstaller.pm line 197.
Use of uninitialized value $pref_name in concatenation (.) or string at
/usr/share/koha/misc/translator/LangInstaller.pm line 239.

1.4) at this point, try not to use memcached and repeat the koha-translate
step, get same error as before

root at myhost:~# vi /etc/koha/koha-sites.conf
...set USE_MEMCACHED="no"

root at myhost:~# koha-translate --update it-IT

Connection to the memcached servers '__MEMCACHED_SERVERS__' failed. Are the
unix socket permissions set properly? Is the host reachable?
If you ignore this warning, you will face performance issues

Connection to the memcached servers '__MEMCACHED_SERVERS__' failed. Are the
unix socket permissions set properly? Is the host reachable?
If you ignore this warning, you will face performance issues
Use of uninitialized value $pref_name in concatenation (.) or string at
/usr/share/koha/misc/translator/LangInstaller.pm line 197.
Use of uninitialized value $pref_name in concatenation (.) or string at
/usr/share/koha/misc/translator/LangInstaller.pm line 239.


So it seems that

I) the language installer tries to connect to memcached, no matter the value of
USE_MEMCACHED

II) the language installer fails to connect to memcached even if the daemon is
up and listening to the right port.

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