体验MySQL MMM
?? ?今天試驗(yàn)了一把MySQL MMM.（MySQL Master-Master Replication Manager）一個(gè)主主復(fù)制的管理工具，它提供了主機(jī)監(jiān)控，MySQL服務(wù)監(jiān)控，復(fù)制線程等多個(gè)方位的監(jiān)控，使用VIP自動(dòng)漂移，可以對(duì)應(yīng)用程序?qū)崿F(xiàn)透明。
?? ?下面是試驗(yàn)步驟：
OS: Ubuntu 11.04 X64DB1:192.168.1.186 (MASTER1)DB2:192.168.1.187 (MASTER2)DB3:192.168.1.184 (SLAVE)Monitor: 192.168.1.175虛擬ip：192.168.1.200（writer），192.168.1.201/202（reader）?? ?MySQL V5.1.50（源碼安裝）
?? ?MMM V2.2.1 下載地址：http://mysql-mmm.org/downloads
?? ?安裝部分參考地址：參考地址：http://mysql-mmm.org/mmm2:guide
?? ?Note：在建立復(fù)制環(huán)境時(shí)需要注意的幾點(diǎn)：
1、server_id 要設(shè)置不同2、Auto_increment_offset=1 Auto_increment_increment=2 （master1 上設(shè)置）Auto_increment_offset=2 Auto_increment_increment=2 （master2上設(shè)置）?? ? ? 可以防止在某master假死并恢復(fù)的瞬間，兩個(gè)“master” 都出現(xiàn)數(shù)據(jù)的更新，導(dǎo)致復(fù)制失敗
?? ?3、master上都要啟用 log_slave_updates,log_bin
?? ?MMM 安裝：
?? ?所需用戶：
| monitor user | used by the mmm monitor to check the health of the MySQL servers | REPLICATION CLIENT |
| agent user | used by the mmm agent to change read-only mode, replication master, etc. | SUPER, REPLICATION CLIENT, PROCESS |
| relication user | used for replication | REPLICATION SLAVE ? |
?? ? perl 依賴包安裝：
?? ??（DB需要安裝部分：）
?? ?monitoring ?安裝部分：
perl -MCPAN -e shell cpan> install Algorithm::Diff cpan> install Class::Singleton cpan> install Log::Dispatch cpan> install Log::Log4perl cpan> install Mail::Send cpan> install Proc::Daemon cpan> install Thread::Queue cpan> install Time::HiRes cpan> install DBIcpan>install DBD::mysql?? ?下載的二進(jìn)制包，直接make ?install (在所有機(jī)器上)
???? MMM主要的功能通過下面三個(gè)腳本來實(shí)現(xiàn)：
mmm_mond
監(jiān)控進(jìn)程，負(fù)責(zé)所有的監(jiān)控工作，決定和處理所有節(jié)點(diǎn)角色活動(dòng)
???? mmm_agentd
運(yùn)行在每個(gè)mysql服務(wù)器上的代理進(jìn)程，完成監(jiān)控的探針工作和執(zhí)行簡(jiǎn)單的遠(yuǎn)端服務(wù)設(shè)置
??? mmm_control
?一個(gè)簡(jiǎn)單的腳本，提供管理mmm_mond進(jìn)程的命令
?? ?配置文件部分：
active_master_role writer <host default>cluster_interface eth0pid_path /var/run/mmm_agentd.pidbin_path /usr/lib/mysql-mmm/replication_user abcreplication_password MMMagent_user mmm_agentagent_password MMMmysql_port 3308 </host> <host db1>ip 192.168.1.186mode masterpeer db2 </host> <host db2>ip 192.168.1.187mode masterpeer db1 </host> <host db3>ip 192.168.1.184mode slave </host> <role writer>hosts db2,db1ips 192.168.1.200mode exclusive </role> <role reader>hosts db2,db3ips 192.168.1.201,192.168.1.202mode balanced </role>?? ?monitoring 部分：
active_master_role writer <host default>cluster_interface eth0pid_path /var/run/mmm_agentd.pidbin_path /usr/lib/mysql-mmm/replication_user abcreplication_password MMMagent_user mmm_agentagent_password MMMmysql_port 3308 </host> <host db1>ip 192.168.1.186mode masterpeer db2 </host> <host db2>ip 192.168.1.187mode masterpeer db1 </host> <host db3>ip 192.168.1.184mode slave </host> <role writer>hosts db2,db1ips 192.168.1.200mode exclusive </role> <role reader>hosts db2,db3ips 192.168.1.201,192.168.1.202mode balanced </role> 安裝好后： mmm_control show 查看狀態(tài)： db1(192.168.1.186) master/ONLINE. Roles: writer(192.168.1.200)db2(192.168.1.187) master/ONLINE. Roles: reader(192.168.1.201)db3(192.168.1.184) slave/ONLINE. Roles: reader(192.168.1.202)?? ?測(cè)試一、db2 宕機(jī)，恢復(fù)情況：
?? ?日志分析：
2012/08/23 17:02:59 WARN Check 'rep_backlog' on 'db2' is in unknown state! Message: UNKNOWN: Connect error (host = 192.168.1.187:3308, user = mmm_monitor)! Lost connection to MySQL server at 'reading initial communication packet', system error: 1112012/08/23 17:02:59 WARN Check 'rep_threads' on 'db2' is in unknown state! Message: UNKNOWN: Connect error (host = 192.168.1.187:3308, user = mmm_monitor)! Lost connection to MySQL server at 'reading initial communication packet', system error: 1112012/08/23 17:03:09 ERROR Check 'mysql' on 'db2' has failed for 10 seconds! Message: ERROR: Connect error (host = 192.168.1.187:3308, user = mmm_monitor)! Lost connection to MySQL server at 'reading initial communication packet', system error: 1112012/08/23 17:03:09 ERROR Check 'rep_threads' on 'db1' has failed for 10 seconds! Message: ERROR: Replication is broken2012/08/23 17:03:10 FATAL State of host 'db2' changed from ONLINE to HARD_OFFLINE (ping: OK, mysql: not OK)2012/08/23 17:03:10 INFO Removing all roles from host 'db2':2012/08/23 17:03:10 INFO Removed role 'reader(192.168.1.201)' from host 'db2'2012/08/23 17:03:10 INFO Orphaned role 'reader(192.168.1.201)' has been assigned to 'db3'?? ?其中我們可以看到，monitor 通過10次 mysql檢查，判定DB2已經(jīng)從 online狀態(tài)到?HARD_OFFLINE ?主機(jī)存在，但是數(shù)據(jù)庫已“死”，DB1的線程也已經(jīng)停止，從 DB2上移除 reader角色到 DB3.
?? ?當(dāng)把DB2啟動(dòng)起來之后，它的狀態(tài)會(huì)變?yōu)?#xff1a;changed from HARD_OFFLINE to AWAITING_RECOVERY，
Check 'rep_threads' on 'db1' is ok!mmm_control set_online db2 手動(dòng)變?yōu)閛nline狀態(tài)，它會(huì)重新獲得reader角色：Admin changed state of 'db2' from AWAITING_RECOVERY to ONLINEINFO Moving role 'reader(192.168.1.202)' from host 'db3' to host 'db2'?? ?測(cè)試二：
?? ?DB1宕機(jī)， DB2應(yīng)該變?yōu)閣riter，db3 slave 把主定向?yàn)閐b2.
?? ?日志分析：
2012/08/23 17:14:51 WARN Check 'rep_threads' on 'db1' is in unknown state! Message: UNKNOWN: Connect error (host = 192.168.1.186:3308, user = mmm_monitor)! Lost connection to MySQL server at 'reading initial communication packet', system error: 1112012/08/23 17:14:51 WARN Check 'rep_backlog' on 'db1' is in unknown state! Message: UNKNOWN: Connect error (host = 192.168.1.186:3308, user = mmm_monitor)! Lost connection to MySQL server at 'reading initial communication packet', system error: 1112012/08/23 17:15:00 ERROR Check 'mysql' on 'db1' has failed for 10 seconds! Message: ERROR: Connect error (host = 192.168.1.186:3308, user = mmm_monitor)! Lost connection to MySQL server at 'reading initial communication packet', system error: 1112012/08/23 17:15:01 ERROR Check 'rep_threads' on 'db2' has failed for 10 seconds! Message: ERROR: Replication is broken2012/08/23 17:15:01 ERROR Check 'rep_threads' on 'db3' has failed for 10 seconds! Message: ERROR: Replication is broken2012/08/23 17:15:02 FATAL State of host 'db1' changed from ONLINE to HARD_OFFLINE (ping: OK, mysql: not OK)2012/08/23 17:15:02 INFO Removing all roles from host 'db1':2012/08/23 17:15:02 INFO Removed role 'writer(192.168.1.200)' from host 'db1'2012/08/23 17:15:02 INFO Orphaned role 'writer(192.168.1.200)' has been assigned to 'db2'2012/08/23 17:15:06 FATAL State of host 'db3' changed from ONLINE to REPLICATION_FAIL2012/08/23 17:15:06 INFO Removing all roles from host 'db3':2012/08/23 17:15:06 INFO Removed role 'reader(192.168.1.201)' from host 'db3'2012/08/23 17:15:06 INFO Check 'rep_threads' on 'db3' is ok!2012/08/23 17:15:06 INFO Orphaned role 'reader(192.168.1.201)' has been assigned to 'db2'2012/08/23 17:15:09 FATAL State of host 'db3' changed from REPLICATION_FAIL to ONLINE2012/08/23 17:15:09 INFO Moving role 'reader(192.168.1.202)' from host 'db2' to host 'db3'?? ?Monitor 檢測(cè)到 DB2和DB3 與DB1 之間的復(fù)制已經(jīng)停止，10次檢查后，確定DB1 已經(jīng) “死掉”，將它的writer ip 轉(zhuǎn)移至 DB2，db3 復(fù)制線程停止后，將其擁有的 reader ip摘除，當(dāng) db3 重新與 DB2建立主從關(guān)系后，又獲得 reader 角色；
?? ?等DB1恢復(fù)后， ?mmm_control show
db1(192.168.1.186) master/ONLINE. Roles: db2(192.168.1.187) master/ONLINE. Roles: reader(192.168.1.201), writer(192.168.1.200)db3(192.168.1.184) slave/ONLINE. Roles: reader(192.168.1.202)?? 手動(dòng)將DB1獲得writer角色：
mmm_control move_role writer db1db1(192.168.1.186) master/ONLINE. Roles: writer(192.168.1.200)db2(192.168.1.187) master/ONLINE. Roles: reader(192.168.1.201)db3(192.168.1.184) slave/ONLINE. Roles: reader(192.168.1.202)?? 在測(cè)試的時(shí)候，間隔要超過60s，原因是：MMM防抖動(dòng)檢測(cè)：
?? 當(dāng)主機(jī)從Online 狀態(tài)轉(zhuǎn)換為HARD_OFFLINE/REPLICATION_FAIL/REPLICATION_DELAY，又從這些狀態(tài)轉(zhuǎn)換為online（在小于60s的情況下）
?? ?MMM 會(huì)阻止這種情況的發(fā)生，我們可以通過配置文件配置它，如果一個(gè)主機(jī)在flap_duration時(shí)間內(nèi)宕掉了flap_count次，就認(rèn)為主機(jī)處理flap狀態(tài)，這個(gè)主機(jī)就不會(huì)自動(dòng)被設(shè)置為ONLINE狀 態(tài)，它將一直處于AWAITING_RECOVERY狀態(tài)除非手動(dòng)設(shè)置online(mmm_control set online host)。如果auto_set_online>0,處于flapping的主機(jī)在flap_duration時(shí)間后將制動(dòng)被設(shè)置為ONLINE 狀態(tài)。
?? 英文參考地址：http://mysql-mmm.org/mysql-mmm.html
?? 中文參考地址：http://linuxguest.blog.51cto.com/195664/578311
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轉(zhuǎn)載于:https://blog.51cto.com/weipengfei/971419
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