The announcement of Percona XtraDB Cluster seems to have generated a fair bit of interest : )
Although the documentation contains more formal instructions for setting up a test cluster, I wanted to share a quick way to set up an ad-hoc cluster on a single machine to help people play with this (imho) rather amazing bit of software.
To do this, you will need kewpie (PXC will have kewpie in-tree soon)
cd basedir;
bzr branch lp:kewpie
edit the file kewpie.py like so:
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 | === modified file 'kewpie.py' --- kewpie.py 2012-01-09 21:17:09 +0000 +++ kewpie.py 2012-01-11 18:32:17 +0000 @@ -49,9 +49,9 @@ from lib.test_mgmt.execution_management # We base / look for a lot of things based on the location of # the kewpie.py file qp_rootdir = os.path.dirname(os.path.abspath(sys.argv[0])) -#project_name = 'percona-xtradb-cluster' +project_name = 'percona-xtradb-cluster' #project_name = 'xtrabackup' -project_name = None +#project_name = None defaults = get_defaults(qp_rootdir,project_name) variables = test_run_options.parse_qp_options(defaults) variables['qp_root'] = qp_rootdir |
Or you may branch kewpie anywhere and simply pass appropriate –basedir and –wsrep-provider-path instructions and use –default-server-type=galera
* A default location of /usr/lib/galera/libgalera_smm.so is assumed
To get your cluster, run the tests with –start-and-exit:
./kewpie.py –start-and-exit
This will start up 3 nodes and join them into a cluster:
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 | percona-xtradb-cluster/kewpie$ ./kewpie.py --start-and-exit Setting --no-secure-file-priv=True for randgen usage... 20120113-125552 INFO Using --no-shm, will not link workdir to shm 20120113-125552 INFO Using mysql source tree: 20120113-125552 INFO basedir: /percona-xtradb-cluster 20120113-125552 INFO clientbindir: /percona-xtradb-cluster/client 20120113-125552 INFO testdir: /percona-xtradb-cluster/kewpie 20120113-125552 INFO server_version: 5.5.17 20120113-125552 INFO server_compile_os: Linux 20120113-125552 INFO server_platform: x86_64 20120113-125552 INFO server_comment: (Source distribution wsrep_22.3.r3683) 20120113-125552 INFO Using default-storage-engine: innodb 20120113-125552 INFO Using testing mode: native 20120113-125552 INFO Processing test suites... 20120113-125552 INFO Found 35 test(s) for execution 20120113-125552 INFO Creating 1 bot(s) 20120113-125604 INFO Taking clean db snapshot... 20120113-125610 INFO Taking clean db snapshot... 20120113-125616 INFO Taking clean db snapshot... 20120113-125621 INFO bot0 server: 20120113-125621 INFO NAME: s0 20120113-125621 INFO MASTER_PORT: 9317 20120113-125621 INFO GALERA_LISTEN_PORT: 9318 20120113-125621 INFO GALERA_RECV_PORT: 9319 20120113-125621 INFO SOCKET_FILE: /percona-xtradb-cluster/kewpie/workdir/bot0/var_s0/my.sock 20120113-125621 INFO VARDIR: /percona-xtradb-cluster/kewpie/workdir/bot0/var_s0 20120113-125621 INFO STATUS: 1 20120113-125621 INFO bot0 server: 20120113-125621 INFO NAME: s1 20120113-125621 INFO MASTER_PORT: 9320 20120113-125621 INFO GALERA_LISTEN_PORT: 9321 20120113-125621 INFO GALERA_RECV_PORT: 9322 20120113-125621 INFO SOCKET_FILE: /percona-xtradb-cluster/kewpie/workdir/bot0/var_s1/my.sock 20120113-125621 INFO VARDIR: /percona-xtradb-cluster/kewpie/workdir/bot0/var_s1 20120113-125621 INFO STATUS: 1 20120113-125621 INFO bot0 server: 20120113-125621 INFO NAME: s2 20120113-125621 INFO MASTER_PORT: 9323 20120113-125621 INFO GALERA_LISTEN_PORT: 9324 20120113-125621 INFO GALERA_RECV_PORT: 9325 20120113-125621 INFO SOCKET_FILE: /percona-xtradb-cluster/kewpie/workdir/bot0/var_s2/my.sock 20120113-125621 INFO VARDIR: /percona-xtradb-cluster/kewpie/workdir/bot0/var_s2 20120113-125621 INFO STATUS: 1 20120113-125621 INFO User specified --start-and-exit. kewpie.py exiting and leaving servers running... |
Now for some play:
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 | $ mysql -uroot --protocol=tcp --port=9317 test Welcome to the MySQL monitor. Commands end with ; or \g. Your MySQL connection id is 6 Server version: 5.5.17-log Source distribution wsrep_22.3.r3683 Type 'help;' or '\h' for help. Type '\c' to clear the current input statement. mysql> create table t1 (a int not null auto_increment, primary key(a)); Query OK, 0 rows affected (0.11 sec) mysql> insert into t1 values (),(),(),(),(); Query OK, 5 rows affected (0.06 sec) Records: 5 Duplicates: 0 Warnings: 0 mysql> select * from t1; +----+ | a | +----+ | 1 | | 4 | | 7 | | 10 | | 13 | +----+ 5 rows in set (0.00 sec) mysql> exit; Bye $ mysql -uroot --protocol=tcp --port=9320 test Reading table information for completion of table and column names You can turn off this feature to get a quicker startup with -A Welcome to the MySQL monitor. Commands end with ; or \g. Your MySQL connection id is 8 Server version: 5.5.17-log Source distribution wsrep_22.3.r3683 Type 'help;' or '\h' for help. Type '\c' to clear the current input statement. mysql> select * from t1; +----+ | a | +----+ | 1 | | 4 | | 7 | | 10 | | 13 | +----+ 5 rows in set (0.00 sec) mysql> exit Bye $ mysql -uroot --protocol=tcp --port=9323 test Reading table information for completion of table and column names You can turn off this feature to get a quicker startup with -A Welcome to the MySQL monitor. Commands end with ; or \g. Your MySQL connection id is 8 Server version: 5.5.17-log Source distribution wsrep_22.3.r3683 Type 'help;' or '\h' for help. Type '\c' to clear the current input statement. mysql> select * from t1; +----+ | a | +----+ | 1 | | 4 | | 7 | | 10 | | 13 | +----+ 5 rows in set (0.00 sec) mysql> exit Bye |
Should you wish to alter the number of nodes or their configuration, you can edit the percona_tests/cluster_basic/suite_config.py file:
1 2 3 | server_requirements = [[],[],[]] server_requests = {'join_cluster':[(0,1), (0,2)]} servers = [] |
Each ‘[]’ in the server_requirements list is a server. You can add new servers by adding a new list. If you want specific options, put them into the list representing the server:
[[‘–innodb-file-per-table’]]
You will need to add an entry into the server_requests dictionary as well. If you added a new node and want it in the cluster you would simply change it as follows:
server_requests = {‘join_cluster’:[(0,1), (0,2), (0,3)]}
When you are done, you may use mode=cleanup to kill off any servers:
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 | ./kewpie.py --mode=cleanup Setting --no-secure-file-priv=True for randgen usage... Setting --start-dirty=True for cleanup mode... 20120113-132229 INFO Using --start-dirty, not attempting to touch directories 20120113-132229 INFO Using mysql source tree: 20120113-132229 INFO basedir: /percona-xtradb-cluster 20120113-132229 INFO clientbindir: /percona-xtradb-cluster/client 20120113-132229 INFO testdir: /percona-xtradb-cluster/kewpie 20120113-132229 INFO server_version: 5.5.17 20120113-132229 INFO server_compile_os: Linux 20120113-132229 INFO server_platform: x86_64 20120113-132229 INFO server_comment: (Source distribution wsrep_22.3.r3683) 20120113-132229 INFO Using default-storage-engine: innodb 20120113-132229 INFO Using testing mode: cleanup 20120113-132229 INFO Killing pid 17040 from /percona-xtradb-cluster/kewpie/workdir/bot0/var_s0/run/my.pid 20120113-132229 INFO Killing pid 17096 from /percona-xtradb-cluster/kewpie/workdir/bot0/var_s2/run/my.pid 20120113-132229 INFO Killing pid 17070 from /percona-xtradb-cluster/kewpie/workdir/bot0/var_s1/run/my.pid 20120113-132229 INFO Stopping all running servers... |
Alternately, you can just let the tests run to ensure some basic functionality. I’ll be writing more about these tests and other testing efforts soon, but I wanted to help people get started with their own explorations.
Happy testing and I hope you dig Percona XtraDB Cluster as much as we do : )
