MySQL备份恢复之Xtrabackup
2018-06-18 01:43:58来源：未知 阅读 ()
Preface
Today,I'm gonna use the Xtrabackup tool to demonstrate the procedure of backing up MySQL db server.The lastest version of Xtrabackup is 2.4.11 nowadays,but i'd rather choose the 2.4.4 version which is more popular now.Here we go.
Procedure
1 ###Download the Xtrabackup tool.### 2 #wget https://www.percona.com/downloads/XtraBackup/Percona-XtraBackup-2.4.4/\ 3 > binary/redhat/7/x86_64/percona-xtrabackup-24-2.4.4-1.el7.x86_64.rpm 4 --2018-06-16 09:33:21-- https://www.percona.com/downloads/XtraBackup/Percona-XtraBackup-2.4.4/binary/redhat/7/x86_64/percona-xtrabackup-24-2.4.4-1.el7.x86_64.rpm 5 Resolving www.percona.com (www.percona.com)... 74.121.199.234 6 Connecting to www.percona.com (www.percona.com)|74.121.199.234|:443... connected. 7 HTTP request sent, awaiting response... 200 OK 8 Length: 7839980 (7.5M) [application/x-redhat-package-manager] 9 Saving to: ‘percona-xtrabackup-24-2.4.4-1.el7.x86_64.rpm’ 10 11 100%[===========================================================================================================>] 7,839,980 48.4KB/s in 5m 14s 12 13 2018-06-16 09:38:36 (24.4 KB/s) - ‘percona-xtrabackup-24-2.4.4-1.el7.x86_64.rpm’ saved [7839980/7839980] 14 15 16 ###Install the Xtrabackup tool.### 17 [root@zlm1 09:39:18 ~] 18 #yum localinstall percona-xtrabackup-24-2.4.4-1.el7.x86_64.rpm 19 Loaded plugins: fastestmirror 20 Repodata is over 2 weeks old. Install yum-cron? Or run: yum makecache fast 21 Examining percona-xtrabackup-24-2.4.4-1.el7.x86_64.rpm: percona-xtrabackup-24-2.4.4-1.el7.x86_64 22 Marking percona-xtrabackup-24-2.4.4-1.el7.x86_64.rpm to be installed 23 Resolving Dependencies 24 --> Running transaction check 25 ---> Package percona-xtrabackup-24.x86_64 0:2.4.4-1.el7 will be installed 26 --> Processing Dependency: rsync for package: percona-xtrabackup-24-2.4.4-1.el7.x86_64 27 base | 3.6 kB 00:00:00 28 epel/x86_64/metalink | 6.8 kB 00:00:00 29 epel | 3.2 kB 00:00:00 30 extras | 3.4 kB 00:00:00 31 updates | 3.4 kB 00:00:00 32 (1/7): base/7/x86_64/group_gz | 166 kB 00:00:00 33 (2/7): extras/7/x86_64/primary_db | 149 kB 00:00:00 34 (3/7): epel/x86_64/group_gz | 88 kB 00:00:00 35 (4/7): base/7/x86_64/primary_db | 5.9 MB 00:00:01 36 (5/7): updates/7/x86_64/primary_db | 2.7 MB 00:00:01 37 (6/7): epel/x86_64/updateinfo | 928 kB 00:00:02 38 (7/7): epel/x86_64/primary | 3.5 MB 00:00:17 39 Determining fastest mirrors 40 * base: mirrors.cn99.com 41 * epel: mirrors.tongji.edu.cn 42 * extras: ftp.sjtu.edu.cn 43 * updates: ftp.sjtu.edu.cn 44 epel 12584/12584 45 --> Processing Dependency: libev.so.4()(64bit) for package: percona-xtrabackup-24-2.4.4-1.el7.x86_64 46 --> Running transaction check 47 ---> Package libev.x86_64 0:4.15-7.el7 will be installed 48 ---> Package rsync.x86_64 0:3.1.2-4.el7 will be installed 49 --> Finished Dependency Resolution 50 51 Dependencies Resolved 52 53 ===================================================================================================================================================== 54 Package Arch Version Repository Size 55 ===================================================================================================================================================== 56 Installing: 57 percona-xtrabackup-24 x86_64 2.4.4-1.el7 /percona-xtrabackup-24-2.4.4-1.el7.x86_64 31 M 58 Installing for dependencies: 59 libev x86_64 4.15-7.el7 extras 44 k 60 rsync x86_64 3.1.2-4.el7 base 403 k 61 62 Transaction Summary 63 ===================================================================================================================================================== 64 Install 1 Package (+2 Dependent packages) 65 66 Total size: 32 M 67 Total download size: 447 k 68 Installed size: 32 M 69 Is this ok [y/d/N]: y 70 Downloading packages: 71 (1/2): libev-4.15-7.el7.x86_64.rpm | 44 kB 00:00:00 72 (2/2): rsync-3.1.2-4.el7.x86_64.rpm | 403 kB 00:00:00 73 ----------------------------------------------------------------------------------------------------------------------------------------------------- 74 Total 1.0 MB/s | 447 kB 00:00:00 75 Running transaction check 76 Running transaction test 77 Transaction test succeeded 78 Running transaction 79 Installing : rsync-3.1.2-4.el7.x86_64 1/3 80 Installing : libev-4.15-7.el7.x86_64 2/3 81 Installing : percona-xtrabackup-24-2.4.4-1.el7.x86_64 3/3 82 Verifying : percona-xtrabackup-24-2.4.4-1.el7.x86_64 1/3 83 Verifying : libev-4.15-7.el7.x86_64 2/3 84 Verifying : rsync-3.1.2-4.el7.x86_64 3/3 85 86 Installed: 87 percona-xtrabackup-24.x86_64 0:2.4.4-1.el7 88 89 Dependency Installed: 90 libev.x86_64 0:4.15-7.el7 rsync.x86_64 0:3.1.2-4.el7 91 92 Complete! 93 94 ###Create a backup user with mixium privileges.### 95 root@localhost:mysql3306.sock [(none)]09:47:08>create user 'bkuser'@'localhost' identified by 'bkuser'; 96 Query OK, 0 rows affected (0.00 sec) 97 98 root@localhost:mysql3306.sock [(none)]09:47:12>grant reload,lock tables,process,replication client on *.* to 'bkuser'@'localhost'; 99 Query OK, 0 rows affected (0.00 sec) 100 101 root@localhost:mysql3306.sock [(none)]09:47:19>flush privileges; 102 Query OK, 0 rows affected (0.00 sec) 103 104 root@localhost:mysql3306.sock [(none)]09:47:30>select user,host from mysql.user; 105 +---------------+--------------+ 106 | user | host | 107 +---------------+--------------+ 108 | repl | 192.168.56.% | 109 | bkuser | localhost | 110 | mysql.session | localhost | 111 | mysql.sys | localhost | 112 | root | localhost | 113 +---------------+--------------+ 114 5 rows in set (0.00 sec)
After install the Xtrabackup,you'll get two programs:xtrabackup & innobackupex.Acturally,both of them can be used to backup or restore the database independently.The innobackupex is a symlink to the xtrabackup C program but in the old version of Xtrabackup it is Perl script.
1 ###Generate a backup by innobackex.### 2 [root@zlm1 11:27:36 ~] 3 #innobackupex --user=bkuser --password=bkuser --defaults-file=/data/mysql/mysql3306/my3306.cnf /data/backup 4 xtrabackup: Error: --defaults-file must be specified first on the command line -- Error shows that it should be put at first place. 5 6 [root@zlm1 11:28:25 ~] 7 #innobackupex --defaults-file=/data/mysql/mysql3306/my3306.cnf --user=bkuser --password=bkuser /data/backup 8 180616 11:28:59 innobackupex: Starting the backup operation 9 10 IMPORTANT: Please check that the backup run completes successfully. 11 At the end of a successful backup run innobackupex 12 prints "completed OK!". 13 14 Can't locate Digest/MD5.pm in @INC (@INC contains: /usr/local/lib64/perl5 /usr/local/share/perl5 /usr/lib64/perl5/vendor_perl /usr/share/perl5/vendor_perl /usr/lib64/perl5 /usr/share/perl5 .) at - line 693. 15 BEGIN failed--compilation aborted at - line 693. 16 180616 11:28:59 Connecting to MySQL server host: localhost, user: bkuser, password: set, port: 3306, socket: /tmp/mysql3306.sock 17 Using server version 5.7.21-log 18 innobackupex version 2.4.4 based on MySQL server 5.7.13 Linux (x86_64) (revision id: df58cf2) 19 xtrabackup: uses posix_fadvise(). 20 xtrabackup: cd to /data/mysql/mysql3306/data 21 xtrabackup: open files limit requested 65535, set to 65535 22 xtrabackup: using the following InnoDB configuration: 23 xtrabackup: innodb_data_home_dir = . 24 xtrabackup: innodb_data_file_path = ibdata1:100M:autoextend 25 xtrabackup: innodb_log_group_home_dir = ./ 26 xtrabackup: innodb_log_files_in_group = 3 27 xtrabackup: innodb_log_file_size = 104857600 28 xtrabackup: using O_DIRECT 29 InnoDB: Number of pools: 1 30 180616 11:28:59 >> log scanned up to (1180581356) 31 xtrabackup: Generating a list of tablespaces 32 InnoDB: Allocated tablespace ID 2 for mysql/plugin, old maximum was 0 33 180616 11:29:00 >> log scanned up to (1180581356) 34 180616 11:29:00 [01] Copying ./ibdata1 to /data/backup/2018-06-16_11-28-59/ibdata1 35 180616 11:29:01 >> log scanned up to (1180581356) 36 180616 11:29:02 >> log scanned up to (1180581356) 37 180616 11:29:03 >> log scanned up to (1180581356) 38 180616 11:29:03 [01] ...done 39 180616 11:29:04 >> log scanned up to (1180581356) 40 180616 11:29:04 [01] Copying ./mysql/plugin.ibd to /data/backup/2018-06-16_11-28-59/mysql/plugin.ibd 41 180616 11:29:04 [01] ...done 42 180616 11:29:04 [01] Copying ./mysql/servers.ibd to /data/backup/2018-06-16_11-28-59/mysql/servers.ibd 43 180616 11:29:04 [01] ...done 44 -- To simplify the output,I omitt the other innodb *.ibd file copy contents. 45 180616 11:29:05 [01] Copying ./zlm/t1.ibd to /data/backup/2018-06-16_11-28-59/zlm/t1.ibd 46 180616 11:29:05 [01] ...done 47 180616 11:29:05 [01] Copying ./zlm/t2.ibd to /data/backup/2018-06-16_11-28-59/zlm/t2.ibd 48 180616 11:29:05 [01] ...done 49 180616 11:29:05 [01] Copying ./zlm/t3.ibd to /data/backup/2018-06-16_11-28-59/zlm/t3.ibd 50 180616 11:29:05 [01] ...done 51 180616 11:29:05 [01] Copying ./zlm/test_flashbk.ibd to /data/backup/2018-06-16_11-28-59/zlm/test_flashbk.ibd 52 180616 11:29:06 >> log scanned up to (1180581356) 53 180616 11:29:06 [01] ...done 54 180616 11:29:07 >> log scanned up to (1180581356) 55 180616 11:29:07 [01] Copying ./zlm/test.ibd to /data/backup/2018-06-16_11-28-59/zlm/test.ibd 56 180616 11:29:07 [01] ...done 57 180616 11:29:08 >> log scanned up to (1180581356) 58 180616 11:29:08 [01] Copying ./zlm/semi_sync_test.ibd to /data/backup/2018-06-16_11-28-59/zlm/semi_sync_test.ibd 59 180616 11:29:08 [01] ...done 60 180616 11:29:09 >> log scanned up to (1180581356) 61 180616 11:29:09 Executing FLUSH NO_WRITE_TO_BINLOG TABLES... 62 180616 11:29:09 Executing FLUSH TABLES WITH READ LOCK... -- Add whole instance read-only lock on tables(but not table locks.) 63 180616 11:29:09 Starting to backup non-InnoDB tables and files 64 180616 11:29:09 [01] Copying ./mysql/db.opt to /data/backup/2018-06-16_11-28-59/mysql/db.opt 65 180616 11:29:09 [01] ...done 66 180616 11:29:09 [01] Copying ./mysql/db.frm to /data/backup/2018-06-16_11-28-59/mysql/db.frm 67 180616 11:29:09 [01] ...done 68 180616 11:29:09 [01] Copying ./mysql/db.MYI to /data/backup/2018-06-16_11-28-59/mysql/db.MYI 69 180616 11:29:09 [01] ...done 70 180616 11:29:09 [01] Copying ./mysql/db.MYD to /data/backup/2018-06-16_11-28-59/mysql/db.MYD 71 -- Omitt portion of the contents. 72 180616 11:29:10 [01] Copying ./performance_schema/file_summary_by_event_name.frm to /data/backup/2018-06-16_11-28-59/performance_schema/file_summary_by_event_name.frm 73 180616 11:29:10 >> log scanned up to (1180581356) 74 180616 11:29:10 [01] ...done 75 180616 11:29:10 [01] Copying ./performance_schema/file_summary_by_instance.frm to /data/backup/2018-06-16_11-28-59/performance_schema/file_summary_by_instance.frm 76 180616 11:29:10 [01] ...done 77 -- Omitt portion of the contents. 78 180616 11:29:11 [01] Copying ./sys/waits_by_user_by_latency.frm to /data/backup/2018-06-16_11-28-59/sys/waits_by_user_by_latency.frm 79 180616 11:29:11 [01] ...done 80 180616 11:29:11 >> log scanned up to (1180581356) 81 180616 11:29:11 [01] Copying ./sys/x@0024innodb_lock_waits.frm to /data/backup/2018-06-16_11-28-59/sys/x@0024innodb_lock_waits.frm 82 180616 11:29:11 [01] ...done 83 -- Omitt portion of the contents. 84 180616 11:29:12 [01] Copying ./zlm/db.opt to /data/backup/2018-06-16_11-28-59/zlm/db.opt 85 180616 11:29:12 [01] ...done 86 180616 11:29:12 [01] Copying ./zlm/t1.frm to /data/backup/2018-06-16_11-28-59/zlm/t1.frm 87 180616 11:29:12 [01] ...done 88 180616 11:29:12 [01] Copying ./zlm/t2.frm to /data/backup/2018-06-16_11-28-59/zlm/t2.frm 89 180616 11:29:12 [01] ...done 90 180616 11:29:12 [01] Copying ./zlm/t3.frm to /data/backup/2018-06-16_11-28-59/zlm/t3.frm 91 180616 11:29:12 [01] ...done 92 180616 11:29:12 [01] Copying ./zlm/test_flashbk.frm to /data/backup/2018-06-16_11-28-59/zlm/test_flashbk.frm 93 180616 11:29:12 [01] ...done 94 180616 11:29:12 [01] Copying ./zlm/test.frm to /data/backup/2018-06-16_11-28-59/zlm/test.frm 95 180616 11:29:12 [01] ...done 96 180616 11:29:12 [01] Copying ./zlm/semi_sync_test.frm to /data/backup/2018-06-16_11-28-59/zlm/semi_sync_test.frm 97 180616 11:29:12 [01] ...done 98 180616 11:29:12 [00] Writing -help/db.opt 99 180616 11:29:12 [00] ...done 100 180616 11:29:12 Finished backing up non-InnoDB tables and files 101 180616 11:29:12 >> log scanned up to (1180581356) 102 180616 11:29:12 [00] Writing xtrabackup_binlog_info 103 180616 11:29:12 [00] ...done 104 180616 11:29:12 Executing FLUSH NO_WRITE_TO_BINLOG ENGINE LOGS... 105 xtrabackup: The latest check point (for incremental): '1180581347' 106 xtrabackup: Stopping log copying thread. 107 .180616 11:29:12 >> log scanned up to (1180581356) 108 109 180616 11:29:12 Executing UNLOCK TABLES -- Release the locks. 110 180616 11:29:12 All tables unlocked 111 180616 11:29:12 [00] Copying ib_buffer_pool to /data/backup/2018-06-16_11-28-59/ib_buffer_pool 112 180616 11:29:12 [00] ...done 113 180616 11:29:12 Backup created in directory '/data/backup/2018-06-16_11-28-59' 114 MySQL binlog position: filename 'mysql-bin.000046', position '194', GTID of the last change '2a4b3562-2ab6-11e8-be7a-080027de0e0e:1-2700058' 115 180616 11:29:12 [00] Writing backup-my.cnf 116 180616 11:29:12 [00] ...done 117 180616 11:29:12 [00] Writing xtrabackup_info 118 180616 11:29:12 [00] ...done 119 xtrabackup: Transaction log of lsn (1180581347) to (1180581356) was copied. -- Point the incremental lsn. 120 180616 11:29:12 completed OK! 121 122 There's an error at the beginning of the backup output below: 123 124 Can't locate Digest/MD5.pm in @INC (@INC contains: /usr/local/lib64/perl5 /usr/local/share/perl5 /usr/lib64/perl5/vendor_perl /usr/share/perl5/vendor_perl /usr/lib64/perl5 /usr/share/perl5 .) at - line 693. 125 BEGIN failed--compilation aborted at - line 693. 126 127 This is caused by lack of package of perl-Digest-MD5,as the innobackex is coded by perl,but I'm afraid it can be ignored,because I've got "completed OK!" message in the end of screen output. 128 129 The backup is normally generated,too.see details below. 130 131 [root@zlm1 11:28:16 ~] 132 #ls -l /data/backup 133 total 4 134 drwxr-x--- 7 root root 4096 Jun 16 11:29 2018-06-16_11-28-59 -- All the backup data and informations stored in this directory. 135 136 [root@zlm1 11:30:27 /data/backup] 137 #cd /data/backup/2018-06-16_11-28-59/ 138 139 [root@zlm1 11:30:57 /data/backup/2018-06-16_11-28-59] 140 #ls -l 141 total 102456 142 -rw-r----- 1 root root 433 Jun 16 11:29 backup-my.cnf 143 drwxr-x--- 2 root root 19 Jun 16 11:29 -help 144 -rw-r----- 1 root root 728 Jun 16 11:29 ib_buffer_pool 145 -rw-r----- 1 root root 104857600 Jun 16 11:29 ibdata1 146 drwxr-x--- 2 root root 4096 Jun 16 11:29 mysql 147 drwxr-x--- 2 root root 8192 Jun 16 11:29 performance_schema 148 drwxr-x--- 2 root root 8192 Jun 16 11:29 sys 149 -rw-r----- 1 root root 68 Jun 16 11:29 xtrabackup_binlog_info -- Contains the binlog position info. 150 -rw-r----- 1 root root 119 Jun 16 11:29 xtrabackup_checkpoints -- Contains teh checkpoint info. 151 -rw-r----- 1 root root 596 Jun 16 11:29 xtrabackup_info -- Contains the Whole info. 152 -rw-r----- 1 root root 2560 Jun 16 11:29 xtrabackup_logfile -- It's a binary file which contains logfile info. 153 drwxr-x--- 2 root root 4096 Jun 16 11:29 zlm 154 155 [root@zlm1 11:30:58 /data/backup/2018-06-16_11-28-59] 156 #cat xtrabackup_binlog_info 157 mysql-bin.000046 194 2a4b3562-2ab6-11e8-be7a-080027de0e0e:1-2700058 158 159 [root@zlm1 11:34:09 /data/backup/2018-06-16_11-28-59] 160 #cat xtrabackup_checkpoints 161 backup_type = full-backuped 162 from_lsn = 0 163 to_lsn = 1180581347 164 last_lsn = 1180581356 165 compact = 0 166 recover_binlog_info = 0 167 168 [root@zlm1 11:34:12 /data/backup/2018-06-16_11-28-59] 169 #cat xtrabackup_info 170 uuid = bad60a4a-7147-11e8-978f-080027de0e0e 171 name = 172 tool_name = innobackupex 173 tool_command = --defaults-file=/data/mysql/mysql3306/my3306.cnf --user=bkuser --password=... /data/backup 174 tool_version = 2.4.4 175 ibbackup_version = 2.4.4 176 server_version = 5.7.21-log 177 start_time = 2018-06-16 11:28:59 178 end_time = 2018-06-16 11:29:12 179 lock_time = 0 180 binlog_pos = filename 'mysql-bin.000046', position '194', GTID of the last change '2a4b3562-2ab6-11e8-be7a-080027de0e0e:1-2700058' 181 innodb_from_lsn = 0 182 innodb_to_lsn = 1180581347 183 partial = N 184 incremental = N 185 format = file 186 compact = N 187 compressed = N 188 encrypted = N 189 190 [root@zlm1 11:34:18 /data/backup/2018-06-16_11-28-59] 191 #strings xtrabackup_logfile 192 xtrabkup 180616 11:28:59 193 :/mysql/gtid_executed.ibd 194 F^<. 195 $2a4b3562-2ab6-11e8-be7a-080027de0e0e 196 ./mysql/gtid_executed.ibd 197 ./mysql/gtid_executed.ibd 198 F^=K8 199 F^=s8 200 F^=| 201 size
Let's see the detail in the general.log file below.It seems very short and simple.Obviously,xtrabckup will also hold lock when backing up like mysqldump does.The time period depents on the amounts of non-innodb tables.
1 [root@zlm1 11:35:01 /data/mysql/mysql3306/data] 2 #cat zlm1.log 3 4 2018-06-16T09:28:59.361317Z 5 Connect bkuser@localhost on using Socket 5 2018-06-16T09:28:59.361444Z 5 Query SET SESSION wait_timeout=2147483 6 2018-06-16T09:28:59.361590Z 5 Query SHOW VARIABLES 7 2018-06-16T09:28:59.364391Z 5 Query SHOW ENGINE INNODB STATUS 8 2018-06-16T09:29:09.442559Z 5 Query SET SESSION lock_wait_timeout=31536000 9 2018-06-16T09:29:09.442693Z 5 Query FLUSH NO_WRITE_TO_BINLOG TABLES -- Finish *.idb file copy operation. 10 2018-06-16T09:29:09.444503Z 5 Query FLUSH TABLES WITH READ LOCK -- There is also FTWRL lock here. 11 2018-06-16T09:29:12.361073Z 5 Query SHOW MASTER STATUS 12 2018-06-16T09:29:12.361330Z 5 Query SHOW VARIABLES 13 2018-06-16T09:29:12.384043Z 5 Query FLUSH NO_WRITE_TO_BINLOG ENGINE LOGS -- Finish redo copy operation. 14 2018-06-16T09:29:12.587336Z 5 Query UNLOCK TABLES -- Release the locks on table.It has spent three seconds in all to hold FTWRL. 15 2018-06-16T09:29:12.600570Z 5 Query SELECT UUID() 16 2018-06-16T09:29:12.600794Z 5 Query SELECT VERSION() 17 2018-06-16T09:29:12.804252Z 5 Quit
Summary
- Xtrabackup is more like a physical backup tool compared with mysqldump,which is usually used to backup whole database.
- FTWRL is inevitable when backing up by Xtrabackup.The holding time depends on the amount of non-innodb tables.
- Furthermore,Xtrabackup supports parallel and incremental backup which mysqldump doesn't support.
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