Tantor

voir aussi → Celeste

Serveur postgresql esclave.

* 9.3.5 le 19/08/2014 par rjuju

Paquets installés : visudo vim screen

config de base :

• IP : 95.142.169.64 / 2001:4b98:dc0:47:216:3eff:fe22:7666
• CPU : 5 coeurs
• RAM : 1080Mo
• Datacenter : Paris
• distro : debian linux 6 64 bits

Configuration de postgres:

postgres@tantor:~$ grep -Ev '^\s*(#.*)?$' /etc/postgresql/9.3/main/postgresql.conf

data_directory = '/var/lib/postgresql/9.3/main'		# use data in another directory
hba_file = '/etc/postgresql/9.3/main/pg_hba.conf'	# host-based authentication file
ident_file = '/etc/postgresql/9.3/main/pg_ident.conf'	# ident configuration file
external_pid_file = '/var/run/postgresql/9.3-main.pid'			# write an extra PID file
listen_addresses = '*'		# what IP address(es) to listen on;
port = 5432				# (change requires restart)
max_connections = 100			# (change requires restart)
unix_socket_directories = '/var/run/postgresql'	# comma-separated list of directories
ssl = true				# (change requires restart)
ssl_cert_file = '/etc/ssl/certs/ssl-cert-snakeoil.pem'		# (change requires restart)
ssl_key_file = '/etc/ssl/private/ssl-cert-snakeoil.key'		# (change requires restart)
shared_buffers = 128MB			# min 128kB
wal_level = hot_standby			# minimal, archive, or hot_standby
checkpoint_completion_target = 0.9	# checkpoint target duration, 0.0 - 1.0
archive_mode = on		# allows archiving to be done
archive_command = 'rsync -a %p postgres@celeste.postgresql.fr:/data/backups/postgresql/xlog/%f'		# command to use to archive a logfile segment
max_wal_senders = 3		# max number of walsender processes
log_checkpoints = on
log_connections = on
log_disconnections = on
log_line_prefix = '%t [%p]: [%l-1] db=%d,user=%u '			# special values:
log_timezone = 'localtime'
datestyle = 'iso, dmy'
timezone = 'localtime'
lc_messages = 'C'			# locale for system error message
lc_monetary = 'fr_FR.UTF-8'			# locale for monetary formatting
lc_numeric = 'fr_FR.UTF-8'			# locale for number formatting
lc_time = 'fr_FR.UTF-8'				# locale for time formatting
default_text_search_config = 'pg_catalog.french'

Crontabs :

postgres@tantor:~$ crontab -l

# m h  dom mon dow   command

#0 1 * * *   pg_dumpall | gzip -c > /var/backups/postgresql/pgsql.daily.sql.gz
#0 2 * * 1   pg_dumpall | gzip -c > /var/backups/postgresql/pgsql.weekly.sql.gz
#0 3 1 * *   pg_dumpall | gzip -c > /var/backups/postgresql/pgsql.monthly.sql.gz
#0 4 * 1 *   pg_dumpall | gzip -c > /var/backups/postgresql/pgsql.yearly.sql.gz
#0 5 * * *   /var/lib/postgresql/backup_pitr.sh
# export vers Tantor
#0 6 * * *   rsync -av --delete /var/backups/postgresql/* tantor.postgresql.fr:/var/backups/postgres-celeste/

# purge des backups
0 7 * * *   /var/lib/postgresql/purge_pitr.sh

Script de sauvegarde PITR:

/var/lib/postgresql/backup_pitr.sh

#!/bin/bash
SRVDEST="celeste.postgresql.fr"
VERSION="9.3"
INST="main"
SNAPNAME="snapshot_$(date '+%Y_%m_%d_%H_%M_%S')"
PGDIR="/var/lib/postgresql/${VERSION}/${INST}/"
DESTDIR="/data/backups/postgresql/snapshot/${SNAPNAME}/"
 
rc=0
 
psql --cluster ${VERSION}/${INST} -c "SELECT pg_start_backup('${SNAPNAME}')"
if [ $? -ne 0 ]; then
    echo "Unable to start backup !"
    exit 1
fi
 
rsync -avp --exclude "pg_xlog/*" ${PGDIR} postgres@${SRVDEST}:${DESTDIR}
if [ $? -ne 0 ]; then
    echo "Error during rsync of ${PGDIR} to postgres@${SRVDEST}:${DESTDIR} !"
    rc=1
fi
 
psql --cluster ${VERSION}/${INST} -c "SELECT pg_stop_backup()"
if [ $? -ne 0 ]; then
    echo "Unable to stop backup !"
    rc=1
fi
 
exit ${rc}

Script de purge PITR :

/var/lib/postgresql/purge_pitr.sh

#!/bin/bash
RETENTION=5
# Suppression des snapshots de plus de $RETENTION jours
find /data/backups/postgresql/snapshot/ -maxdepth 1 -type d -name "snapshot_*" -mtime +${RETENTION} -print -exec rm -rf {} \;
 
# Suppression des WAL de plus de $RETENTION jours
find /data/backups/postgresql/xlog/ -type f -mtime +${RETENTION} -print -delete

Recovery.conf :

/var/lib/postgresql/9.3/main/recovery.conf

standby_mode = on
primary_conninfo = 'host=celeste.postgresql.fr port=5432 user=repli'
restore_command = 'cp /data/backups/postgresql/xlog/%f %p'
# pas de cleanup comme on a une sauvegarde pitr, ils seront purgés par le cron PITR
# pas de trigger file

Template de recovery.conf :

/var/lib/postgresql/recovery.conf

standby_mode = on
primary_conninfo = 'host=celeste.postgresql.fr port=5432 user=repli'
restore_command = 'cp /data/backups/postgresql/xlog/%f %p'
# pas de cleanup comme on a une sauvegarde pitr, ils seront purgés par le cron PITR
# pas de trigger file

Liens symboliques :

• /data → /srv/data_tantor
• /var/lib/postgresql → /data/var/lib/postgresql/
• /var/log → /data/var/log/
• /var/www → /data/var/www/