PostgreSQL replicación esclavos multi

es:PostgreSQL replicación esclavos multi en:PostgreSQL replication slaves multi he:PostgreSQL שכפול עבדים רב ro:PostgreSQL replicare sclavi multi ru:PostgreSQL репликации рабы multi pl:PostgreSQL replikacji niewolników multi ja:PostgreSQL のレプリケーション スレーブ マルチ ar:كيو النسخ المتماثل العبيد متعددة zh:PostgreSQL 复制奴隶多 de:PostgreSQL Replikation Sklaven multi nl:PostgreSQL replicatie slaven multi it:PostgreSQL replica schiavi multi pt:Multi de escravos de replicação PostgreSQL fr:Replication PostgreSQL multi slaves

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Introducción

Esta página trata sobre la configuración de la replicación asíncrona de transmisión de PostgreSQL con un maestro y dos esclavos. Nuestros esclavos se configurarán como espera activa, es decir, será posible ejecutar consultas (solo lectura) en ellos.

Postgres01 (10.1.1.75) : Para quitarlo, desde el maestro

Postgres02 (10.1.1.90) :

Postgres03 (10.1.1.199) :

"#"  "$".

/etc/hosts  ()  :

# cat /etc/hosts
127.0.0.1       localhost

10.1.1.75       postgres01
10.1.1.90       postgres02
10.1.1.199      postgres03

:

# echo "deb http://apt.postgresql.org/pub/repos/apt/ jessie-pgdg main" > /etc/apt/sources.list.d/postgres.list

:

# gpg --keyserver pgpkeys.mit.edu --recv-key 7FCC7D46ACCC4CF8 && gpg -a --export 7FCC7D46ACCC4CF8 | apt-key add -
gpg: directory `/root/.gnupg' created
gpg: new configuration file `/root/.gnupg/gpg.conf' created
gpg: WARNING: options in `/root/.gnupg/gpg.conf' are not yet active during this run
gpg: keyring `/root/.gnupg/secring.gpg' created
gpg: keyring `/root/.gnupg/pubring.gpg' created
gpg: requesting key ACCC4CF8 from hkp server pgpkeys.mit.edu
gpg: /root/.gnupg/trustdb.gpg: trustdb created
gpg: key ACCC4CF8: public key "PostgreSQL Debian Repository" imported
gpg: no ultimately trusted keys found
gpg: Total number processed: 1
gpg:               imported: 1  (RSA: 1)
OK

:

# apt-get update

( 9.5 ) :

# apt-get install postgresql

()  ()  :

# passwd postgres

# su - postgres

$ ssh-keygen

:

(postgres01 )  (postgres02 )  (postgres03) :

root@postgres01:~# su - postgres

postgres@postgres01:~$ ssh-copy-id postgres02

postgres@postgres01:~$ ssh-copy-id postgres03

:

root@postgres02:~# su - postgres

postgres@postgres02:~$ ssh-copy-id postgres01

postgres@postgres02:~$ ssh-copy-id postgres03

:

root@postgres03:~# su - postgres

postgres@postgres03:~$ ssh-copy-id postgres01

postgres@postgres03:~$ ssh-copy-id postgres02

(postgres01 ) :

/ :

# su - postgres

$ psql -c "CREATE USER repuser REPLICATION LOGIN CONNECTION LIMIT 2 ENCRYPTED PASSWORD '<mot de passe repuser>';"

 : 2 2

/etc/postgresql/9.5/main/postgresql.conf  :

listen_addresses = '*'
wal_level = hot_standby
archive_mode = on
archive_command = 'rsync -av %p postgres@<ip du premier slave>:/var/lib/postgresql/wal_archive/%f'
max_wal_senders = 2
wal_keep_segments = 256
hot_standby = on

: ()

/etc/postgresql/9.5/main/pg_hba.conf  :

hostssl replication     repuser <ip du réseau de vos serveurs>/24     md5

()

() :

# systemctl restart postgresql

:

root@postgres01:~# systemctl status postgresql
● postgresql.service - PostgreSQL RDBMS
   Loaded: loaded (/lib/systemd/system/postgresql.service; enabled)
   Active: active (exited) since Thu 2016-06-02 12:06:28 CEST; 22s ago
  Process: 77056 ExecStart=/bin/true (code=exited, status=0/SUCCESS)
 Main PID: 77056 (code=exited, status=0/SUCCESS)

root@postgres01:~# ps -u postgres u
USER        PID %CPU %MEM    VSZ   RSS TTY      STAT START   TIME COMMAND
postgres  77038  0.0  4.4 227300 21836 ?        S    12:06   0:00 /usr/lib/postgresql/9.5/bin/postgres -D /var/lib/postgresql/9.
postgres  77040  0.0  0.8 227300  4160 ?        Ss   12:06   0:00 postgres: checkpointer process
postgres  77041  0.0  1.0 227300  4968 ?        Ss   12:06   0:00 postgres: writer process
postgres  77042  0.0  1.7 227300  8776 ?        Ss   12:06   0:00 postgres: wal writer process
postgres  77043  0.0  1.3 227728  6708 ?        Ss   12:06   0:00 postgres: autovacuum launcher process
postgres  77044  0.0  0.6  82244  3392 ?        Ss   12:06   0:00 postgres: archiver process
postgres  77045  0.0  0.8  82244  4244 ?        Ss   12:06   0:00 postgres: stats collector process

:

# systemctl stop postgresql

/etc/postgresql/9.5/main/postgresql.conf  :

listen_addresses = '*'
wal_level = hot_standby
archive_mode = on
archive_command = 'rsync -av %p postgres@<ip du second slave>:/var/lib/postgresql/wal_archive/%f'
max_wal_senders = 2
wal_keep_segments = 256
hot_standby = on

/etc/postgresql/9.5/main/pg_hba.conf  () :

hostssl replication     repuser <ip du réseau de vos serveurs>/24     md5

 :

:

# su – postgres

:

$ mkdir /var/lib/postgresql/wal_archive

:

$ rm -rf /var/lib/postgresql/9.5/main

() :

$ pg_basebackup -h <ip de votre master> -D /var/lib/postgresql/9.5/main -U repuser -v -P --xlog

/var/lib/postgresql/9.5/main/recovery.conf  :

standby_mode = on
primary_conninfo = 'host=<ip de votre master> port=5432 user=repuser password=<mot de passe de repuser> sslmode=require application_name=<hostname de votre slave>'
trigger_file = '/var/lib/postgresql/9.5/postgres.trigger'

 :

:

# systemctl start postgresql

:

# systemctl status postgresql
● postgresql.service - PostgreSQL RDBMS
   Loaded: loaded (/lib/systemd/system/postgresql.service; enabled)
   Active: active (exited) since Thu 2016-06-02 12:53:42 CEST; 1min 6s ago
  Process: 8894 ExecStart=/bin/true (code=exited, status=0/SUCCESS)
 Main PID: 8894 (code=exited, status=0/SUCCESS)

# ps -u postgres u
USER        PID %CPU %MEM    VSZ   RSS TTY      STAT START   TIME COMMAND
postgres   8878  0.0  4.4 227308 21892 ?        S    12:53   0:00 /usr/lib/postgresql/9.5/bin/postgres -D /var/lib/postgresql/9.
postgres   8879  0.0  1.1 227376  5700 ?        Ss   12:53   0:00 postgres: startup process   recovering 00000001000000000000000
postgres   8880  0.0  0.8 227308  4140 ?        Ss   12:53   0:00 postgres: checkpointer process
postgres   8881  0.0  1.0 227308  5236 ?        Ss   12:53   0:00 postgres: writer process
postgres   8882  0.0  0.6  82252  3316 ?        Ss   12:53   0:00 postgres: stats collector process
postgres   8883  0.0  1.7 238064  8520 ?        Ss   12:53   0:00 postgres: wal receiver process   streaming 0/30003E0

:

:

# su - postgres

:

$ psql

:

postgres=# \x
Expanded display is on.

postgres=# select * from pg_stat_replication;
-[ RECORD 1 ]----+------------------------------
pid              | 78879
usesysid         | 16384
usename          | repuser
application_name | postgres02
client_addr      | 10.1.1.90
client_hostname  |
client_port      | 49009
backend_start    | 2016-06-02 12:53:36.641823+02
backend_xmin     |
state            | streaming
sent_CRElocation    | 0/30004C0
write_location   | 0/30004C0
flush_location   | 0/30004C0
replay_location  | 0/30004C0
sync_priority    | 0
sync_state       | async

/ ()

:

# su – postgres

:

$ psql

:

postgres=# \x
Expanded display is on.

postgres=# select * from pg_stat_replication;
-[ RECORD 1 ]----+------------------------------
pid              | 78879
usesysid         | 16384
usename          | repuser
application_name | postgres02
client_addr      | 10.1.1.90
client_hostname  |
client_port      | 49009
backend_start    | 2016-06-02 12:53:36.641823+02
backend_xmin     |
state            | streaming
sent_location    | 0/5000140
write_location   | 0/5000140
flush_location   | 0/5000140
replay_location  | 0/5000140
sync_priority    | 0
sync_state       | async
-[ RECORD 2 ]----+------------------------------
pid              | 82725
usesysid         | 16384
usename          | repuser
application_name | postgres03
client_addr      | 10.1.1.199
client_hostname  |
client_port      | 51754
backend_start    | 2016-06-02 14:31:43.759683+02
backend_xmin     |
state            | streaming
sent_location    | 0/5000140
write_location   | 0/5000140
flush_location   | 0/5000140
replay_location  | 0/5000140
sync_priority    | 0
sync_state       | async

2  (postgres02 03).

(ex : checkrep)  :

postgres=# CREATE DATABASE checkrep;

2  :

root@postgres02:~# su - postgres

postgres@postgres02:~$ psql
psql (9.5.3)
Type "help" for help.

postgres=# \l
                                  List of databases
   Name    |  Owner   | Encoding |   Collate   |    Ctype    |   Access privileges
-----------+----------+----------+-------------+-------------+-----------------------
 checkrep  | postgres | UTF8     | en_US.UTF-8 | en_US.UTF-8 |
 postgres  | postgres | UTF8     | en_US.UTF-8 | en_US.UTF-8 |
 template0 | postgres | UTF8     | en_US.UTF-8 | en_US.UTF-8 | =c/postgres          +
           |          |          |             |             | postgres=CTc/postgres
 template1 | postgres | UTF8     | en_US.UTF-8 | en_US.UTF-8 | =c/postgres          +
           |          |          |             |             | postgres=CTc/postgres
(4 rows)

root@postgres03:~# su - postgres
postgres@postgres03:~$ psql
psql (9.5.3)
Type "help" for help.

postgres=# \l
                                  List of databases
   Name    |  Owner   | Encoding |   Collate   |    Ctype    |   Access privileges
-----------+----------+----------+-------------+-------------+-----------------------
 checkrep  | postgres | UTF8     | en_US.UTF-8 | en_US.UTF-8 |
 postgres  | postgres | UTF8     | en_US.UTF-8 | en_US.UTF-8 |
 template0 | postgres | UTF8     | en_US.UTF-8 | en_US.UTF-8 | =c/postgres          +
           |          |          |             |             | postgres=CTc/postgres
 template1 | postgres | UTF8     | en_US.UTF-8 | en_US.UTF-8 | =c/postgres          +
           |          |          |             |             | postgres=CTc/postgres
(4 rows)

:

postgres=# DROP DATABASE checkrep;

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