-yum install etckeeper\r
+# instalirati etckeeper da čuva /etc/ direktorij u git-u\r
+# (nije na produkcijskom enviromentu)\r
+\r
+yum install etckeeper\r
cd /etc/\r
git config --global user.email "dpavlin@rot13.org"\r
git config --global user.name "Dobrica Pavlinusic"\r
git commit -m base\r
\r
\r
+PostgreSQL replikacija, wal shipping, streaming, host standby\r
+\r
\r
https://www.postgresql.org/docs/9.6/static/warm-standby.html\r
\r
‘.ssh/id_rsa.pub’ -> ‘.ssh/authorized_keys’\r
\r
\r
-prekopirati isti kljuc i authoriorized keys na slave:\r
+## prekopirati isti kljuc i authoriorized keys na slave:\r
\r
\r
[root@edozvola-db-01 pgsql]# rsync -rav .ssh edozvola-db-02:`pwd`\r
\r
\r
\r
-kreirati testnu bazu i tablicu\r
+# kreirati testnu bazu i tablicu\r
+\r
[root@edozvola-db-01 ~]# sudo -u postgres createdb test\r
[root@edozvola-db-01 ~]# sudo -u postgres psql test\r
test=# create table test1 ( id serial, a text, b int ) ;\r
INSERT 0 1\r
\r
\r
-nfs share za wal fileove\r
+\r
+# nfs share za wal fileove\r
+\r
[root@edozvola-db-pgpool ~]# yum install nfs-utils nfs4-acl-tools\r
[root@edozvola-db-pgpool ~]# systemctl enable nfs-server.service\r
Created symlink from /etc/systemd/system/multi-user.target.wants/nfs-server.service to /usr/lib/systemd/system/nfs-server.service.\r
[root@edozvola-db-pgpool ~]# systemctl start nfs-server.service\r
\r
-\r
[root@edozvola-db-pgpool ~]# mkdir -p /shared/pgsql\r
[root@edozvola-db-pgpool ~]# chown postgres /shared/pgsql/\r
\r
-\r
[root@edozvola-db-pgpool ~]# vi /etc/exports\r
\r
-\r
[root@edozvola-db-pgpool ~]# cat /etc/exports\r
/shared/pgsql edozvola-db-01(rw,no_root_squash) edozvola-db-02(rw,no_root_squash)\r
\r
-\r
[root@edozvola-db-pgpool ~]# exportfs -va\r
exporting edozvola-db-01:/shared/pgsql\r
exporting edozvola-db-02:/shared/pgsql\r
\r
\r
-mount na database serverima\r
+\r
+# mount na database serverima\r
+\r
[root@edozvola-db-01 ~]# yum install nfs-utils nfs4-acl-tools\r
[root@edozvola-db-01 ~]# mkdir -p /shared/pgsql\r
[root@edozvola-db-01 ~]# vi /etc/fstab\r
\r
-\r
[root@edozvola-db-01 ~]# grep shared /etc/fstab\r
edozvola-db-pgpool:/shared/pgsql /shared/pgsql nfs defaults 0 0\r
\r
-\r
[root@edozvola-db-01 ~]# mount /shared/pgsql/\r
\r
-\r
-provjeriti da li postgresql korisnik moze pisati po nfs share-u\r
-\r
+## provjeriti da li postgresql korisnik moze pisati po nfs share-u\r
\r
[root@edozvola-db-01 ~]# sudo -u postgres touch /shared/pgsql/test-01\r
[root@edozvola-db-01 ~]# ls -al /shared/pgsql/test-01\r
-rw-r--r-- 1 postgres postgres 0 Aug 18 13:57 /shared/pgsql/test-01\r
[root@edozvola-db-01 ~]# rm -f /shared/pgsql/test-01\r
\r
-\r
-isto ponoviti na edozvola-db-02!\r
-\r
+## isto ponoviti na edozvola-db-02!\r
\r
\r
\r
\r
\r
-\r
-\r
-\r
-\r
-\r
-\r
-podesiti wal archiving\r
-\r
+# podesiti wal archiving\r
\r
https://www.postgresql.org/docs/9.6/static/continuous-archiving.html\r
\r
\r
[root@edozvola-db-01 ~]# vi /var/lib/pgsql/9.6/data/postgresql.conf\r
-wal_level = replica\r
-archive_mode = on\r
-max_wal_senders = 1 \r
-max_replication_slots = 1\r
-archive_command = 'test ! -f /shared/pgsql/%f && cp %p /shared/pgsql/%f'\r
-hot_standby = on\r
-\r
-\r
+wal_level = replica # same as hot_standby\r
\r
+# https://www.postgresql.org/docs/9.6/static/runtime-config-wal.html#GUC-SYNCHRONOUS-COMMIT\r
+synchronous_commit = on\r
\r
+archive_mode = on\r
+archive_command = 'test ! -f /shared/pgsql/%f && cp %p /shared/pgsql/%f'\r
\r
+max_wal_senders = 3 \r
+max_replication_slots = 3\r
\r
+hot_standby = on\r
\r
\r
[root@edozvola-db-01 ~]# systemctl restart postgresql-9.6.service\r
\r
\r
\r
+# kreirati replication korisnika\r
\r
-\r
-\r
-\r
-\r
-\r
-\r
-\r
-\r
-\r
-\r
-\r
-\r
-kreirati replication korisnika\r
[root@edozvola-db-01 ~]# sudo -u postgres psql\r
\r
-\r
postgres=# create user replication with password 'replication123' login replication ;\r
CREATE ROLE\r
\r
\r
host replication replication 10.200.1.62/24 md5\r
\r
-\r
-netmask je /24 da mozemo imati istu konfiguraciju na oba node-a\r
+## netmask je /24 da mozemo imati istu konfiguraciju na oba node-a\r
\r
\r
\r
\r
\r
-\r
-testirati replikaciju\r
+# testirati replikaciju\r
[root@edozvola-db-01 ~]# sudo -u postgres psql test\r
test=# insert into test1 (a,b) values ('baz',3);\r
INSERT 0 1\r
\r
\r
\r
-\r
+# recovery.conf\r
\r
[root@edozvola-db-02 ~]# cat recovery.conf\r
standby_mode = 'on'\r
\r
\r
\r
-skripte\r
-promoviranje slave-a u master\r
+# skripte\r
\r
\r
[root@edozvola-db-01 pgsql]# pwd\r
/var/lib/pgsql\r
-[root@edozvola-db-01 pgsql]# cat promote-slave-to-master.sh\r
-#!/bin/sh -xe\r
-\r
\r
\r
+## promoviranje slave-a u master\r
\r
+[root@edozvola-db-01 pgsql]# cat promote-slave-to-master.sh\r
+#!/bin/sh -xe\r
/usr/pgsql-9.6/bin/pg_ctl --pgdata=/var/lib/pgsql/9.6/data promote\r
\r
\r
+## kreiranje slave instance od mastera\r
\r
-\r
-\r
-\r
-kreiranje slave instance od mastera\r
[root@edozvola-db-01 pgsql]# cat create-pgsql-slave.sh\r
#!/bin/sh -e\r
\r
-\r
# WARNING: this script depends that two database nodes have IPs which and in x1 and x2\r
# tr 12 21 does swap from currnet node number/ip to other one!\r
\r
-\r
test "`whoami`" != "postgres" && echo "$0 needs to be run as postgres user!" && exit 1\r
\r
-\r
here=`hostname -s`\r
there=`hostname -s | tr 12 21`\r
\r
-\r
my_ip=`ip addr | grep 10.200.1. | sed 's/^.*\(10\.200\.1\.[0-9]*\)\/.*$/\1/'`\r
other_ip=`echo $my_ip | tr 12 21`\r
\r
-\r
echo "Create slave on $here $my_ip using data from master on $there $other_ip"\r
echo "[enter] to start"\r
read\r
\r
-\r
#systemctl stop postgresql-9.6.service || true\r
/usr/pgsql-9.6/bin/pg_ctl --pgdata=/var/lib/pgsql/9.6/data stop || true\r
\r
-\r
echo "select pg_start_backup('slave')" | ssh $there psql\r
\r
-\r
rsync -rav --delete --exclude pg_xlog $there:/var/lib/pgsql/9.6/data/ /var/lib/pgsql/9.6/data/\r
\r
-\r
echo "select pg_stop_backup()" | ssh $there psql\r
\r
-\r
test -e /var/lib/pgsql/9.6/data/recovery.done || ( echo "ERROR: no recovery.done !" && exit 1 )\r
cat /var/lib/pgsql/9.6/data/recovery.done | sed -e s/$my_ip/$other_ip/ > /var/lib/pgsql/9.6/data/recovery.conf\r
\r
\r
\r
\r
-hot_standby?\r