After reading more carefully the forum and making some assumptions here there is what made my Zimbra installation go ok:
1. At the near end of the installation disable the start of services with 'r' key when the installation summary menu appears.
Run as a Zimbra:
zmlocalconfig -e zmmtaconfig_interval=3600
zmlocalconfig -e zmstat_interval=300
zmlocalconfig -e mailboxd_java_heap_memory_percent=10
zmlocalconfig -e mailboxd_java_heap_new_size_percent=10
zmlocalconfig -e mailboxd_java_options="-server -Djava.awt.headless=true -XX:+UseConcMarkSweepGC -XX:NewRatio=2 -XX:PermSize=128m \
zmlocalconfig -e ldap_common_threads=16
zmlocalconfig -e ldap_common_toolthreads=8
zmlocalconfig -e ldap_db_cachesize=50000
zmlocalconfig -e ldap_db_idlcachesize=50000
zmlocalconfig -e ldap_db_dncachesize=0
zmprov mcf zimbraMessageCacheSize 5000
(instead of 644245094)
innodb_buffer_pool_size = 144245094
(instead of 10).
Tip: use w! in vi in order to force the saving of the file.
After doing of all these I can start zimbra with:
and RAM suffers a bit but after all the services have started I have 700 MB free RAM out of 2 GB total RAM.
I suppose that I can also tweak the httpd number of instances (currently 5) but they only consume 0.1% of RAM and it does not matter to me.
Is there any low resources wiki page that I am not aware of that might have these tricks and another ones?
And... if you see that some of my settings are not appropiated or might give me some problems... please advise, I am actually a Zimbra newbie.