Percona XtraDB Cluster Debian howto

Percona XtraDB MySQL Cluster unter Debian Squeeze installieren

Welche verteile hat der Percona XtraDB MySQL Cluster:

  • Synchronous replication
  • Multi-master replication support
  • Parallel replication
  • Automatic node provisioning

Für diese Installation wird Benötigt.

Drei Server / VM´s mit Debian Squeeze oder höher

Debian Server für die Installation vorbereiten

Hosts Einträge erstellen.

nano /etc/hosts

192.168.70.110  percona-mysql01.example.local percona-mysql01
192.168.70.111  percona-mysql02.example.local percona-mysql02
192.168.70.112  percona-mysql03.example.local percona-mysql03

APT vorbereiten

gpg --keyserver hkp://keys.gnupg.net --recv-keys 1C4CBDCDCD2EFD2A
gpg -a --export CD2EFD2A | apt-key add -

APT Source list editieren

nano /etc/apt/sources.list

#
#  Percona XtraDB MySQL
#
deb http://repo.percona.com/apt squeeze main
deb-src http://repo.percona.com/apt squeeze main

Benötigte Pakete installieren

apt-get update
apt-get install percona-xtradb-cluster-client-5.5 percona-xtradb-cluster-server-5.5 percona-xtradb-cluster-galera-2.x percona-xtrabackup mytop

Bei der Installation kann ein Root Passwort vergeben werden.
Dies ist nicht unbedingt nötig, sollte aber gesetzt werden.

Root Passwort in /root/.my.cnf eintragen

nano /root/.my.cnf

[client]
user=root
password=ROOT_PASSWORT

 

Durch die Installation unter Debian muss noch das Passwort vom debian-sys-maint geändert werden. Dieses muss auf allen Servern gleich sein.

Um das Passwort in der MySQL Datenbank zu ändern wird dieser Befehl benötigt.
GRANT ALL PRIVILEGES ON *.* TO 'debian-sys-maint'@'localhost' IDENTIFIED BY 'GLEICHES_PASSWORT' WITH GRANT OPTION;

mysql
GRANT ALL PRIVILEGES ON *.* TO 'debian-sys-maint'@'localhost' IDENTIFIED BY 'GLEICHES_PASSWORT' WITH GRANT OPTION;
flush privileges;

Das vergebene Passwort in die /etc/mysql/debian.cnf eingetragen.

nano /etc/mysql/debian.cnf

# Automatically generated for Debian scripts. DO NOT TOUCH!
[client]
host     = localhost
user     = debian-sys-maint
password = GLEICHES_PASSWORT
socket   = /var/run/mysqld/mysqld.sock
[mysql_upgrade]
host     = localhost
user     = debian-sys-maint
password = GLEICHES_PASSWORT
socket   = /var/run/mysqld/mysqld.sock
basedir  = /usr

Nachdem dies alles auf allen drei Nodes gemacht wurde, wird MySQL erstmal gestoppt.

/etc/init.d/mysql stop

Auf den Nodes 02 und 03 wird der Inhalt des /var/lib/mysql Verzeichnisses gelöscht.

rm -r /var/lib/mysql/*

Erste Node Konfigurieren

nano /etc/mysql/my.cnf

[mysqld]
wsrep_provider=/usr/lib/libgalera_smm.so
wsrep_cluster_address=gcomm://percona-mysql02:4567,percona-mysql03:4567,0.0.0.0:4567
wsrep_slave_threads=8
wsrep_node_name=node1
wsrep_sst_method=xtrabackup
wsrep_sst_auth=root:ROOT_PASSWORT
wsrep_cluster_name=MYSQL_CLUSTER_NAME

binlog_format=ROW
default_storage_engine=InnoDB

innodb_autoinc_lock_mode=2
innodb_locks_unsafe_for_binlog=1
innodb_file_per_table

datadir=/var/lib/mysql
user=mysql

Befehlserklärung:

  • wsrep_cluster_address=gcomm://
    Hier werden die Beteiligten Nodes eingetragen
  • wsrep_slave_threads=8
    Anzahl der Replikation Threads
  • wsrep_node_name=node1
    Name der Node, am besten immer node1,node2,node3,..
  • wsrep_sst_method=xtrabackup
    Replikation Methode wenn die node nicht aktuell ist. Es gibt rsync und xtrabackup
  • wsrep_sst_auth=root:ROOT_PASSWORT
    xtrabackup benötigt das root Passwort darum wird es hier eingegeben.
  • wsrep_cluster_name=MYSQL_CLUSTER_NAME
    Interner Name für den Percona Cluster.

Erste node Starten.

/etc/init.d/mysql start

Zweite und dritte Node Konfigurieren

nano /etc/mysql/my.cnf

Node2

[mysqld]
wsrep_provider=/usr/lib/libgalera_smm.so
wsrep_cluster_address=gcomm://percona-mysql01:4567,percona-mysql03:4567,0.0.0.0:4567
wsrep_slave_threads=8
wsrep_node_name=node2
wsrep_sst_method=xtrabackup
wsrep_sst_auth=root:ROOT_PASSWORT
wsrep_cluster_name=MYSQL_CLUSTER_NAME

binlog_format=ROW
default_storage_engine=InnoDB

innodb_autoinc_lock_mode=2
innodb_locks_unsafe_for_binlog=1
innodb_file_per_table

datadir=/var/lib/mysql
user=mysql

Node3

[mysqld]
wsrep_provider=/usr/lib/libgalera_smm.so
wsrep_cluster_address=gcomm://percona-mysql01:4567,percona-mysql02:4567,0.0.0.0:4567
wsrep_slave_threads=8
wsrep_node_name=node3
wsrep_sst_method=xtrabackup
wsrep_sst_auth=root:ROOT_PASSWORT
wsrep_cluster_name=MYSQL_CLUSTER_NAME

binlog_format=ROW
default_storage_engine=InnoDB

innodb_autoinc_lock_mode=2
innodb_locks_unsafe_for_binlog=1
innodb_file_per_table

datadir=/var/lib/mysql
user=mysql

Wenn man jetzt die Node2 startet kann man unter /var/log/mysql/mysql.err das hinzufügen der Node beobachten.

 tail -f /var/log/mysql/mysql.err

130310 17:39:11 mysqld_safe Starting mysqld daemon with databases from /var/lib/mysql
130310 17:39:12 mysqld_safe WSREP: Running position recovery with --log_error=/tmp/tmp.2xPW5HbXFa
130310 17:39:13 mysqld_safe WSREP: Failed to recover position:
130310 17:39:13 [Note] WSREP: Read nil XID from storage engines, skipping position init
130310 17:39:13 [Note] WSREP: wsrep_load(): loading provider library '/usr/lib/libgalera_smm.so'
130310 17:39:13 [Note] WSREP: wsrep_load(): Galera 2.3(r143) by Codership Oy <info@codership.com> loaded succesfully.
130310 17:39:13 [Warning] WSREP: Could not open saved state file for reading: /var/lib/mysql//grastate.dat
130310 17:39:13 [Note] WSREP: Found saved state: 00000000-0000-0000-0000-000000000000:-1
130310 17:39:13 [Note] WSREP: Preallocating 134219048/134219048 bytes in '/var/lib/mysql//galera.cache'...
130310 17:39:13 [Note] WSREP: Passing config to GCS: base_host = 192.168.70.112; base_port = 4567; cert.log_conflicts = no; gcache.dir = /var/lib/mysql/; gcache.keep_pages_size = 0; gcache.mem_size = 0; gcache.name = /var/lib/mysql//galera.cache; gcache.page_size = 128M; gcache.size = 128M; gcs.fc_debug = 0; gcs.fc_factor = 1; gcs.fc_limit = 16; gcs.fc_master_slave = NO; gcs.max_packet_size = 64500; gcs.max_throttle = 0.25; gcs.recv_q_hard_limit = 9223372036854775807; gcs.recv_q_soft_limit = 0.25; gcs.sync_donor = NO; replicator.causal_read_timeout = PT30S; replicator.commit_order = 3
130310 17:39:13 [Note] WSREP: Assign initial position for certification: -1, protocol version: -1
130310 17:39:13 [Note] WSREP: wsrep_sst_grab()
130310 17:39:13 [Note] WSREP: Start replication
130310 17:39:13 [Note] WSREP: Setting initial position to 00000000-0000-0000-0000-000000000000:-1
130310 17:39:13 [Note] WSREP: protonet asio version 0
130310 17:39:13 [Note] WSREP: backend: asio
130310 17:39:13 [Note] WSREP: GMCast version 0
130310 17:39:13 [Note] WSREP: (0a83f9bb-89a1-11e2-0800-08c508ce7632, 'tcp://0.0.0.0:4567') listening at tcp://0.0.0.0:4567
130310 17:39:13 [Note] WSREP: (0a83f9bb-89a1-11e2-0800-08c508ce7632, 'tcp://0.0.0.0:4567') multicast: , ttl: 1
130310 17:39:13 [Note] WSREP: EVS version 0
130310 17:39:13 [Note] WSREP: PC version 0
130310 17:39:13 [Note] WSREP: gcomm: connecting to group 'MYSQL_CLUSTER_NAME', peer 'percona-mysql01:4567,percona-mysql02:4567,0.0.0.0:4567'
130310 17:39:13 [Note] WSREP: declaring 11e6a6ea-88b8-11e2-0800-f482b3a2f316 stable
130310 17:39:13 [Note] WSREP: declaring bb98bc76-88b9-11e2-0800-6d63e5403959 stable
130310 17:39:13 [Note] WSREP: view(view_id(PRIM,0a83f9bb-89a1-11e2-0800-08c508ce7632,29) memb {
        0a83f9bb-89a1-11e2-0800-08c508ce7632,
        11e6a6ea-88b8-11e2-0800-f482b3a2f316,
        bb98bc76-88b9-11e2-0800-6d63e5403959,
} joined {
} left {
} partitioned {
})
130310 17:39:13 [Note] WSREP: gcomm: connected
130310 17:39:13 [Note] WSREP: Changing maximum packet size to 64500, resulting msg size: 32636
130310 17:39:13 [Note] WSREP: Shifting CLOSED -> OPEN (TO: 0)
130310 17:39:13 [Note] WSREP: Opened channel 'MYSQL_CLUSTER_NAME'
130310 17:39:13 [Note] WSREP: New COMPONENT: primary = yes, bootstrap = no, my_idx = 0, memb_num = 3
130310 17:39:13 [Note] WSREP: Waiting for SST to complete.
130310 17:39:13 [Note] WSREP: STATE_EXCHANGE: sent state UUID: 0ad0b4d7-89a1-11e2-0800-bcb798ad9fa5
130310 17:39:13 [Note] WSREP: STATE EXCHANGE: sent state msg: 0ad0b4d7-89a1-11e2-0800-bcb798ad9fa5
130310 17:39:13 [Note] WSREP: STATE EXCHANGE: got state msg: 0ad0b4d7-89a1-11e2-0800-bcb798ad9fa5 from 0 (node3)
130310 17:39:13 [Note] WSREP: STATE EXCHANGE: got state msg: 0ad0b4d7-89a1-11e2-0800-bcb798ad9fa5 from 1 (node2)
130310 17:39:13 [Note] WSREP: STATE EXCHANGE: got state msg: 0ad0b4d7-89a1-11e2-0800-bcb798ad9fa5 from 2 (node1)
130310 17:39:13 [Note] WSREP: Quorum results:
        version    = 2,
        component  = PRIMARY,
        conf_id    = 28,
        members    = 2/3 (joined/total),
        act_id     = 1046947,
        last_appl. = -1,
        protocols  = 0/4/2 (gcs/repl/appl),
        group UUID = ac789a2c-88af-11e2-0800-3d09894f5600
130310 17:39:13 [Note] WSREP: Flow-control interval: [28, 28]
130310 17:39:13 [Note] WSREP: Shifting OPEN -> PRIMARY (TO: 1046947)
130310 17:39:13 [Note] WSREP: State transfer required:
        Group state: ac789a2c-88af-11e2-0800-3d09894f5600:1046947
        Local state: 00000000-0000-0000-0000-000000000000:-1
130310 17:39:13 [Note] WSREP: New cluster view: global state: ac789a2c-88af-11e2-0800-3d09894f5600:1046947, view# 29: Primary, number of nodes: 3, my index: 0, protocol version 2
130310 17:39:13 [Warning] WSREP: Gap in state sequence. Need state transfer.
130310 17:39:15 [Note] WSREP: Running: 'wsrep_sst_xtrabackup - alternative way to do SST --role 'joiner' --address '192.168.70.112' --auth 'root:ROOT_PASSWORT' --datadir '/var/lib/mysql/' --defaults-file '/etc/mysql/my.cnf' --parent '19067''
130310 17:39:16 [Note] WSREP: Prepared SST request: xtrabackup - alternative way to do SST|192.168.70.112:4444/xtrabackup_sst
130310 17:39:16 [Note] WSREP: wsrep_notify_cmd is not defined, skipping notification.
130310 17:39:16 [Note] WSREP: Assign initial position for certification: 1046947, protocol version: 2
130310 17:39:16 [Warning] WSREP: Failed to prepare for incremental state transfer: Local state UUID (00000000-0000-0000-0000-000000000000) does not match group state UUID (ac789a2c-88af-11e2-0800-3d09894f5600): 1 (Operation not permitted)
         at galera/src/replicator_str.cpp:prepare_for_IST():442. IST will be unavailable.
130310 17:39:16 [Note] WSREP: Node 0 (node3) requested state transfer from '*any*'. Selected 1 (node2)(SYNCED) as donor.
130310 17:39:16 [Note] WSREP: Shifting PRIMARY -> JOINER (TO: 1046947)
130310 17:39:16 [Note] WSREP: Requesting state transfer: success, donor: 1
130310 17:42:24 [Note] WSREP: 1 (node2): State transfer to 0 (node3) complete.
130310 17:42:24 [Note] WSREP: Member 1 (node2) synced with group.
130310 17:42:39 [Note] WSREP: SST complete, seqno: 1048400
130310 17:42:39 [Note] Plugin 'FEDERATED' is disabled.
130310 17:42:39 InnoDB: The InnoDB memory heap is disabled
130310 17:42:39 InnoDB: Mutexes and rw_locks use GCC atomic builtins
130310 17:42:39 InnoDB: Compressed tables use zlib 1.2.3
130310 17:42:39 InnoDB: Using Linux native AIO
130310 17:42:39 InnoDB: Initializing buffer pool, size = 256.0M
130310 17:42:39 InnoDB: Completed initialization of buffer pool
130310 17:42:39 InnoDB: highest supported file format is Barracuda.
130310 17:42:39  InnoDB: Waiting for the background threads to start
130310 17:42:40 Percona XtraDB (http://www.percona.com) 1.1.8-rel29.1 started; log sequence number 374651553292
130310 17:42:40 [Note] Server hostname (bind-address): '0.0.0.0'; port: 3306
130310 17:42:40 [Note]   - '0.0.0.0' resolves to '0.0.0.0';
130310 17:42:40 [Note] Server socket created on IP: '0.0.0.0'.
130310 17:42:40 [Note] Event Scheduler: Loaded 0 events
130310 17:42:40 [Note] WSREP: Signalling provider to continue.
130310 17:42:40 [Note] WSREP: SST received: ac789a2c-88af-11e2-0800-3d09894f5600:1048400
130310 17:42:40 [Note] /usr/sbin/mysqld: ready for connections.
Version: '5.5.29-55-log'  socket: '/var/run/mysqld/mysqld.sock'  port: 3306  Percona XtraDB Cluster (GPL), wsrep_23.7.2.r3843
130310 17:42:40 [Note] WSREP: 0 (node3): State transfer from 1 (node2) complete.
130310 17:42:40 [Note] WSREP: Shifting JOINER -> JOINED (TO: 1048668)
130310 17:42:41 [Note] WSREP: Member 0 (node3) synced with group.
130310 17:42:41 [Note] WSREP: Shifting JOINED -> SYNCED (TO: 1048668)
130310 17:42:41 [Note] WSREP: Synchronized with group, ready for connections
130310 17:42:41 [Note] WSREP: wsrep_notify_cmd is not defined, skipping notification.

Dies kann je nach Datenbank Inhalt und Netzwerk geschwindigkeit etwas dauern.

Prüfen ob die Replikation funktioniert

mysql
SHOW STATUS LIKE 'wsrep_local_state_comment';

Wenn da so aussieht passt alles

+---------------------------+------------+
| Variable_name             | Value      |
+---------------------------+------------+
| wsrep_local_state_comment | Synced (6) |
+---------------------------+------------+
1 row in set (0.00 sec)
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