PXC5.7集羣部署
PXC三節點安裝：
node1：10.157.26.132
node2：10.157.26.133
node3：10.157.26.134
配置服務器ssh登陸無密碼驗證
ssh-keygen實現三臺主機之間相互免密鑰登陸，保證三臺主機之間能ping通
1)在全部的主機上執行：
# ssh-keygen -t rsa
2)將全部機子上公鑰（id_rsa.pub）導到一個主機的/root/.ssh/authorized_keys文件中,而後將authorized_keys分別拷貝到全部主機上
cat /root/.ssh/id_rsa.pub >> /root/.ssh/authorized_keys
ssh 10.157.26.133 cat /root/.ssh/id_rsa.pub >> /root/.ssh/authorized_keys
ssh 10.157.26.134 cat /root/.ssh/id_rsa.pub >> /root/.ssh/authorized_keys
scp /root/.ssh/authorized_keys 10.157.26.133:/root/.ssh/authorized_keys
scp /root/.ssh/authorized_keys 10.157.26.134:/root/.ssh/authorized_keys
測試：ssh 10.157.26.133/10.157.26.134
安裝依賴包：
yum install -y git scons gcc gcc-c++ openssl check cmake bison boost-devel asio-devel libaio-devel ncurses-devel readline-devel pam-devel socat
若socat沒法用yum安裝，可下載源碼包安裝
tar zxvf socat-1.7.3.2.tar.gz
cd socat-1.7.3.2
./configure
make && make install
一、將二進制包解壓，添加mysql帳號，作軟鏈接【三個節點都要操做】：
mkdir /opt/mysql
cd /opt/mysql
tar zxvf /data/src/Percona-XtraDB-Cluster-5.7.17-rel13-29.20.3.Linux.x86_64.ssl101.tar.gz
cd /usr/local
ln -s /opt/mysql/Percona-XtraDB-Cluster-5.7.17-rel13-29.20.3.Linux.x86_64.ssl101/ mysql
groupadd mysql
useradd -M -g mysql -s /sbin/nologin/ -d /usr/local/mysql mysql
二、新建文件夾請受權【三個節點都要操做】 ：
mkdir -p /data/mysql/mysql_3306/{data,logs,tmp}
mkdir -p /data/mysql/mysql_3306/logs/binlog
chown -R mysql:mysql /data/mysql/
chown -R mysql:mysql /usr/local/mysql
三、配置文件my.cnf
132的配置文件：
default_storage_engine=Innodb
#pxc
wsrep_provider = /usr/local/mysql/lib/libgalera_smm.so #庫文件位置
wsrep_cluster_address = gcomm://10.157.26.132,10.157.26.133,10.157.26.134 #集羣中全部節點的ip
wsrep_node_name = node132 #本節點的名字
wsrep_node_address = 10.157.26.132 #本節點的ip
wsrep_cluster_name = pxc_sampson #集羣名字
wsrep_sst_auth = sst:sampson #sst模式須要的用戶名和密碼
wsrep_sst_method = xtrabackup-v2 #採用什麼方式複製數據。還支持mysqldump，rsync
wsrep_slave_threads = 2 # 開啓的複製線程數，建議cpu核數*2 ，解決apply_cb跟不上問題
pxc_strict_mode = ENFORCING #pxc嚴厲模式，還有DISABLED、PERMISSIVE、MASTER可選
innodb_autoinc_lock_mode = 2 #自增鎖的優化
wsrep_provider_options = "debug=1;gcache.size=1G" #打開調試模式
133的配置文件：
default_storage_engine=Innodb
#pxc
wsrep_provider = /usr/local/mysql/lib/libgalera_smm.so
wsrep_cluster_address = gcomm://10.157.26.132,10.157.26.133,10.157.26.134
wsrep_node_name = node133
wsrep_node_address = 10.157.26.133
wsrep_cluster_name = pxc_sampson
wsrep_sst_auth = sst:sampson
wsrep_sst_method = rsync
wsrep_slave_threads = 2
pxc_strict_mode = ENFORCING
innodb_autoinc_lock_mode = 2
wsrep_provider_options = "debug=1;gcache.size=1G"
134的配置文件：
default_storage_engine=Innodb
#pxc
wsrep_provider = /usr/local/mysql/lib/libgalera_smm.so
wsrep_cluster_address = gcomm://10.157.26.132,10.157.26.133,10.157.26.134
wsrep_node_name = node134
wsrep_node_address = 10.157.26.134
wsrep_cluster_name = pxc_sampson
wsrep_sst_auth = sst:sampson
wsrep_sst_method = rsync
wsrep_slave_threads = 2
pxc_strict_mode = ENFORCING
innodb_autoinc_lock_mode = 2
wsrep_provider_options = "debug=1;gcache.size=1G"
【注：原本全部節點的wsrep_sst_method均配置爲xtrabackup-v2，可是添加第二個節點時報錯：WSREP_SST: [ERROR] Error while getting data from donor node: exit codes: 137 0，換成了rsync後，就沒有問題了，待驗證是不是xtrabackup的版本問題，我以前用的是2.4.7】
四、啓動節點1【132上執行】：
/usr/local/mysql/bin/mysqld --defaults-file=/data/mysql/mysql_3306/my_3306.cnf
--wsrep-new-cluster
【注：當node1啓動的時候，它會先嚐試加入一個已存在的集羣，可是如今集羣並不存在，pxc必須從0開始，因此node1的啓動必須加上命令--wsrep-new-cluster，用於新建一個新的集羣。node1正常啓動以後，其餘的node就能夠使用平時的啓動方式，它們都會自動鏈接上primary node】
在error.log裏看到
[Note] WSREP: Shifting JOINED -> SYNCED (TO: 7)
[Note] WSREP: Waiting for SST/IST to complete.
[Note] WSREP: New cluster view: global state: f71affa6-2b55-11e7-b8db-6afbe908670d:7, view# 1: Primary, number of nodes: 1, my index: 0, protocol version 3
則啓動成功，登陸mysql -S /tmp/mysql_3306.sock -p
節點一密碼在error.log中：
[root@dpstcmsweb00 ~]# cat /data/mysql/mysql_3306/logs/error.log |grep password
2017-05-09T02:46:25.724852Z 1 [Note] A temporary password is generated for root@localhost: worQi;aYF9eQ
登陸進去後修改root密碼：mysql>set password=password('mysql');
主節點添加帳號：
grant usage on *.* to 'pxc-monitor'@'%' identified by 'pxc-monitor';
grant all privileges on *.* to 'sst'@'%' identified by 'sampson';
五、啓動剩下的兩個節點【133/134上執行】 ：
/usr/local/mysql/bin/mysqld --defaults-file=/data/mysql/mysql_3306/my_3306.cnf &
查看對應的error.log，能看到
[Note] WSREP: Shifting JOINER -> JOINED (TO: 7)
[Note] WSREP: Member 1.0 (node3307) synced with group.
[Note] WSREP: Shifting JOINED -> SYNCED (TO: 7)
[Note] WSREP: Synchronized with group, ready for connections
則表示node啓動並加入cluster集羣成功。
啓動成功後，直接使用節點1上的帳號密碼登陸便可，這裏是mysql -uroot -pmysql
六、查看節點個數：
"root@localhost:mysql_3306.sock [(none)]>show global status like 'wsrep_cluster_size';
+--------------------+-------+
| Variable_name | Value |
+--------------------+-------+
| wsrep_cluster_size | 3 |
+--------------------+-------+
1 row in set (0.00 sec)
七、查看集羣狀態
"root@localhost:mysql_3306.sock [(none)]>show global status like 'wsrep%';
+------------------------------+----------------------------------------------------------+
| Variable_name | Value |
+------------------------------+----------------------------------------------------------+
| wsrep_local_state_uuid | bed19806-3465-11e7-85af-731d83552ec6 |
| wsrep_protocol_version | 7 |
| wsrep_last_committed | 4 |
| wsrep_replicated | 3 |
| wsrep_replicated_bytes | 732 |
| wsrep_repl_keys | 3 |
| wsrep_repl_keys_bytes | 93 |
| wsrep_repl_data_bytes | 447 |
| wsrep_repl_other_bytes | 0 |
| wsrep_received | 36 |
| wsrep_received_bytes | 3494 |
| wsrep_local_commits | 0 |
| wsrep_local_cert_failures | 0 |
| wsrep_local_replays | 0 |
| wsrep_local_send_queue | 0 |
| wsrep_local_send_queue_max | 1 |
| wsrep_local_send_queue_min | 0 |
| wsrep_local_send_queue_avg | 0.000000 |
| wsrep_local_recv_queue | 0 |
| wsrep_local_recv_queue_max | 2 |
| wsrep_local_recv_queue_min | 0 |
| wsrep_local_recv_queue_avg | 0.027778 |
| wsrep_local_cached_downto | 2 |
| wsrep_flow_control_paused_ns | 0 |
| wsrep_flow_control_paused | 0.000000 |
| wsrep_flow_control_sent | 0 |
| wsrep_flow_control_recv | 0 |
| wsrep_flow_control_interval | [ 173, 173 ] |
| wsrep_flow_control_status | OFF |
| wsrep_cert_deps_distance | 1.000000 |
| wsrep_apply_oooe | 0.000000 |
| wsrep_apply_oool | 0.000000 |
| wsrep_apply_window | 1.000000 |
| wsrep_commit_oooe | 0.000000 |
| wsrep_commit_oool | 0.000000 |
| wsrep_commit_window | 1.000000 |
| wsrep_local_state | 4 |
| wsrep_local_state_comment | Synced |
| wsrep_cert_index_size | 1 |
| wsrep_cert_bucket_count | 22 |
| wsrep_gcache_pool_size | 2932 |
| wsrep_causal_reads | 0 |
| wsrep_cert_interval | 0.000000 |
| wsrep_ist_receive_status | |
| wsrep_incoming_addresses | 10.157.26.134:3306,10.157.26.132:3306,10.157.26.133:3306 |
| wsrep_desync_count | 0 |
| wsrep_evs_delayed | |
| wsrep_evs_evict_list | |
| wsrep_evs_repl_latency | 0/0/0/0/0 |
| wsrep_evs_state | OPERATIONAL |
| wsrep_gcomm_uuid | 5665b42e-3467-11e7-94ff-9e77d0294b5e |
| wsrep_cluster_conf_id | 17 |
| wsrep_cluster_size | 3 |
| wsrep_cluster_state_uuid | bed19806-3465-11e7-85af-731d83552ec6 |
| wsrep_cluster_status | Primary |
| wsrep_connected | ON |
| wsrep_local_bf_aborts | 0 |
| wsrep_local_index | 1 |
| wsrep_provider_name | Galera |
| wsrep_provider_vendor | Codership Oy <info@codership.com> |
| wsrep_provider_version | 3.20(r) |
| wsrep_ready | ON |
+------------------------------+----------------------------------------------------------+
62 rows in set (0.00 sec)
注：
wsrep_cluster_status:
1.OPEN: 節點啓動成功，嘗試鏈接到集羣，若是失敗則根據配置退出或建立新的集羣
2.PRIMARY: 節點處於集羣pc中，嘗試從集羣中選取donor進行數據同步
3.JOINER: 節點處於等待接收/接收數據文件狀態，數據傳輸完成後在本地加載數據
4.JOINED: 節點完成數據同步工做，嘗試保持和集羣進度一致
5.SYNCED：節點正常提供服務：數據的讀寫，集羣數據的同步，新加入節點的sst請求
6.DONOR(貢獻數據者)：節點處於爲新節點準備或傳輸集羣全量數據狀態，對客戶端不可用。
PXC相關文檔將持續更新。。。
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