X-Git-Url: http://git.rot13.org/?p=edozvola;a=blobdiff_plain;f=edozvola-dpavlin.txt;h=b8ab38b18b7842dfb62d142dce70fe79be3caf15;hp=38ef4e668fb9ba672dabcf229f4e982e916718d9;hb=3fd8e6627e01f259fdeeef08ba4b764780a79e98;hpb=9378e506deedce3157ae710b2a543bea8e026338

diff --git a/edozvola-dpavlin.txt b/edozvola-dpavlin.txt
index 38ef4e6..b8ab38b 100644
--- a/edozvola-dpavlin.txt
+++ b/edozvola-dpavlin.txt
@@ -1,10 +1,15 @@
-yum install etckeeper
+# instalirati etckeeper da čuva /etc/ direktorij u git-u
+# (nije na produkcijskom enviromentu)
+
+yum install etckeeper
 cd /etc/
 git config --global user.email "dpavlin@rot13.org"
 git config --global user.name "Dobrica Pavlinusic"
 git commit -m base
 
 
+PostgreSQL replikacija, wal shipping, streaming, host standby
+
 
 https://www.postgresql.org/docs/9.6/static/warm-standby.html
 
@@ -26,7 +31,7 @@ bash-4.2$ cp -v .ssh/id_rsa.pub .ssh/authorized_keys
 ‘.ssh/id_rsa.pub’ -> ‘.ssh/authorized_keys’
 
 
-prekopirati isti kljuc i authoriorized keys na slave:
+## prekopirati isti kljuc i authoriorized keys na slave:
 
 
 [root@edozvola-db-01 pgsql]# rsync -rav .ssh edozvola-db-02:`pwd`
@@ -44,7 +49,8 @@ sending incremental file list
 
 
 
-kreirati testnu bazu i tablicu
+# kreirati testnu bazu i tablicu
+
 [root@edozvola-db-01 ~]# sudo -u postgres createdb test
 [root@edozvola-db-01 ~]# sudo -u postgres psql test
 test=# create table test1 ( id serial, a text, b int ) ;
@@ -54,106 +60,80 @@ test=# insert into test1 (a,b) values ('bar',1234) ;
 INSERT 0 1
 
 
-nfs share za wal fileove
+
+# nfs share za wal fileove
+
 [root@edozvola-db-pgpool ~]# yum install nfs-utils nfs4-acl-tools
 [root@edozvola-db-pgpool ~]# systemctl enable nfs-server.service
 Created symlink from /etc/systemd/system/multi-user.target.wants/nfs-server.service to /usr/lib/systemd/system/nfs-server.service.
 [root@edozvola-db-pgpool ~]# systemctl start nfs-server.service
 
-
 [root@edozvola-db-pgpool ~]# mkdir -p /shared/pgsql
 [root@edozvola-db-pgpool ~]# chown postgres /shared/pgsql/
 
-
 [root@edozvola-db-pgpool ~]# vi /etc/exports
 
-
 [root@edozvola-db-pgpool ~]# cat /etc/exports
 /shared/pgsql edozvola-db-01(rw,no_root_squash) edozvola-db-02(rw,no_root_squash)
 
-
 [root@edozvola-db-pgpool ~]# exportfs -va
 exporting edozvola-db-01:/shared/pgsql
 exporting edozvola-db-02:/shared/pgsql
 
 
-mount na database serverima
+
+# mount na database serverima
+
 [root@edozvola-db-01 ~]# yum install nfs-utils nfs4-acl-tools
 [root@edozvola-db-01 ~]# mkdir -p /shared/pgsql
 [root@edozvola-db-01 ~]# vi /etc/fstab
 
-
 [root@edozvola-db-01 ~]# grep shared /etc/fstab
 edozvola-db-pgpool:/shared/pgsql        /shared/pgsql   nfs     defaults        0 0
 
-
 [root@edozvola-db-01 ~]# mount /shared/pgsql/
 
-
-provjeriti da li postgresql korisnik moze pisati po nfs share-u
-
+## provjeriti da li postgresql korisnik moze pisati po nfs share-u
 
 [root@edozvola-db-01 ~]# sudo -u postgres touch /shared/pgsql/test-01
 [root@edozvola-db-01 ~]# ls -al /shared/pgsql/test-01
 -rw-r--r-- 1 postgres postgres 0 Aug 18 13:57 /shared/pgsql/test-01
 [root@edozvola-db-01 ~]# rm -f /shared/pgsql/test-01
 
-
-isto ponoviti na edozvola-db-02!
-
+## isto ponoviti na edozvola-db-02!
 
 
 
 
 
-
-
-
-
-
-
-podesiti wal archiving
-
+# podesiti wal archiving
 
 https://www.postgresql.org/docs/9.6/static/continuous-archiving.html
 
 
 [root@edozvola-db-01 ~]# vi /var/lib/pgsql/9.6/data/postgresql.conf
-wal_level = replica
-archive_mode = on
-max_wal_senders = 1 
-max_replication_slots = 1
-archive_command = 'test ! -f /shared/pgsql/%f && cp %p /shared/pgsql/%f'
-hot_standby = on
-
-
+wal_level = replica # same as hot_standby
 
+# https://www.postgresql.org/docs/9.6/static/runtime-config-wal.html#GUC-SYNCHRONOUS-COMMIT
+synchronous_commit = on
 
+archive_mode = on
+archive_command = 'test ! -f /shared/pgsql/%f && cp %p /shared/pgsql/%f'
 
+max_wal_senders = 3 
+max_replication_slots = 3
 
+hot_standby = on
 
 
 [root@edozvola-db-01 ~]# systemctl restart postgresql-9.6.service
 
 
 
+# kreirati replication korisnika
 
-
-
-
-
-
-
-
-
-
-
-
-
-kreirati replication korisnika
 [root@edozvola-db-01 ~]# sudo -u postgres psql
 
-
 postgres=# create user replication with password 'replication123' login replication ;
 CREATE ROLE
 
@@ -163,15 +143,13 @@ CREATE ROLE
 
 host    replication     replication     10.200.1.62/24          md5
 
-
-netmask je /24 da mozemo imati istu konfiguraciju na oba node-a
+## netmask je /24 da mozemo imati istu konfiguraciju na oba node-a
 
 
 
 
 
-
-testirati replikaciju
+# testirati replikaciju
 [root@edozvola-db-01 ~]# sudo -u postgres psql test
 test=# insert into test1 (a,b) values ('baz',3);
 INSERT 0 1
@@ -232,7 +210,7 @@ da bi svi podaci zavrsili na slave-u, na masteru je dobro izvrsiti komandu check
 
 
 
-
+# recovery.conf
 
 [root@edozvola-db-02 ~]# cat recovery.conf
 standby_mode = 'on'
@@ -243,63 +221,49 @@ archive_cleanup_command = 'pg_archivecleanup /shared/pgsql %r'
 
 
 
-skripte
-promoviranje slave-a u master
+# skripte
 
 
 [root@edozvola-db-01 pgsql]# pwd
 /var/lib/pgsql
-[root@edozvola-db-01 pgsql]# cat promote-slave-to-master.sh
-#!/bin/sh -xe
-
 
 
+## promoviranje slave-a u master
 
+[root@edozvola-db-01 pgsql]# cat promote-slave-to-master.sh
+#!/bin/sh -xe
 /usr/pgsql-9.6/bin/pg_ctl --pgdata=/var/lib/pgsql/9.6/data promote
 
 
+## kreiranje slave instance od mastera
 
-
-
-
-kreiranje slave instance od mastera
 [root@edozvola-db-01 pgsql]# cat create-pgsql-slave.sh
 #!/bin/sh -e
 
-
 # WARNING: this script depends that two database nodes have IPs which and in x1 and x2
 # tr 12 21 does swap from currnet node number/ip to other one!
 
-
 test "`whoami`" != "postgres" && echo "$0 needs to be run as postgres user!" && exit 1
 
-
 here=`hostname -s`
 there=`hostname -s | tr 12 21`
 
-
 my_ip=`ip addr | grep 10.200.1. | sed 's/^.*\(10\.200\.1\.[0-9]*\)\/.*$/\1/'`
 other_ip=`echo $my_ip | tr 12 21`
 
-
 echo "Create slave on $here $my_ip using data from master on $there $other_ip"
 echo "[enter] to start"
 read
 
-
 #systemctl stop postgresql-9.6.service || true
 /usr/pgsql-9.6/bin/pg_ctl --pgdata=/var/lib/pgsql/9.6/data stop || true
 
-
 echo "select pg_start_backup('slave')" | ssh $there psql
 
-
 rsync -rav --delete --exclude pg_xlog $there:/var/lib/pgsql/9.6/data/ /var/lib/pgsql/9.6/data/
 
-
 echo "select pg_stop_backup()" | ssh $there psql
 
-
 test -e /var/lib/pgsql/9.6/data/recovery.done || ( echo "ERROR: no recovery.done !" && exit 1 )
 cat /var/lib/pgsql/9.6/data/recovery.done | sed -e s/$my_ip/$other_ip/ > /var/lib/pgsql/9.6/data/recovery.conf
 
@@ -314,4 +278,3 @@ cat /var/lib/pgsql/9.6/data/recovery.done | sed -e s/$my_ip/$other_ip/ > /var/li
 
 
 
-hot_standby?