阿里云数据库RDS MySQL 物理全备文件数据恢复至自建数据库Mysql 5.7中

不念不忘少年蓝@ 2022-11-07 14:33 386阅读 0赞

# 环境介绍： #

CentOS 7.5

Mysql 5.7

percona-xtrabackup-24

# 注意事项 #

操作系统中已安装数据恢复工具Percona XtraBackup，您可以从Percona XtraBackup官网下载安装。

*  MySQL 5.6及之前的版本需要安装 Percona XtraBackup 2.3，安装指导请参见官方文档Percona  
    XtraBackup 2.3。
 *  MySQL 5.7版本需要安装 Percona XtraBackup 2.4，安装指导请参见官方文档Percona XtraBackup  
    2.4。
 *  MySQL 8.0版本需要安装 Percona XtraBackup 8.0，安装指导请参见官方文档Percona XtraBackup  
    8.0。

自建MySQL数据库安装在64位的Linux系统中，且与云数据库MySQL版的版本相同。

# 备份恢复操作步骤 #

1.登录RDS管理控制台。  
 2.在页面左上角，选择实例所在地域。  
 3.找到目标实例，单击实例ID。  
 4.在左侧导航栏中单击备份恢复。  
 5.选择数据备份标签页。  
 6.选择查询的时间范围，然后单击查询。  
 7.在数据备份列表中，找到要下载的数据备份，并单击其右侧的下载。  
![在这里插入图片描述][2021031217095526.png]  
 8.在实例备份文件下载窗口，单击复制外网地址旁的复制图标，获取数据备份文件外网下载地址。  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzQwOTA3OTc3_size_16_color_FFFFFF_t_70]  
 9.登录服务器。  
 10.执行如下命令，下载数据备份文件。

wget -c ‘<数据备份文件外网下载地址>’ -O <自定义文件名>

\-c：启用断点续传模式。  
  -O：将下载的结果保存为指定的文件（使用URL中包含的文件名后缀 .tar.gz 、.xb.gz 或 \_qp.xb）。

11.innobackupex解压命令需要安装qpress，下载qpress工具，然后使用如下命令安装：

下载qpress

[root@test2 ~]# mkdir crmdb
    
    [root@test2 ~]# cd crmdb
    
    [root@test2 ~]# ls crmdb/
    hins8537769_data_20200708132950.tar  qpress-11-linux-x64.tar
    
    [root@test2 ~]# ll crmdb/
    总用量 403196
    -rw-r--r-- 1 root root 412790614 7月   9 10:53 hins8537769_data_20200708132950.tar    //RDS数据库全备文件
    -rw-r--r-- 1 root root     81920 7月   9 14:00 qpress-11-linux-x64.tar
    
    [root@test2 ~]# tar -xvf crmdb/qpress-11-linux-x64.tar
    qpress
    
    [root@test2 ~]# chmod 755 qpress
    
    [root@test2 ~]# cp qpress /usr/bin/

12.执行如下命令，解压已下载的数据备份文件。

目前物理备份集文件有3种格式：

*  tar 压缩包 （.tar.gz 后缀）
 *  xbstream 压缩包 （.xb.gz 后缀）
 *  xbstream 文件包（\_qp.xb 后缀）

1.对于tar 压缩包 （.tar.gz 后缀），使用命令：

tar -izxvf <数据备份文件名>.tar.gz -C  <数据库恢复到这个目录>

2.对于xbstream 压缩包 （.xb.gz 后缀），使用命令：

gzip -d -c <数据备份文件名>.xb.gz | xbstream -x -v -C  <数据库恢复到这个目录>

3.对于xbstream 文件包（\_qp.xb 后缀），使用命令：

--解包
    cat <数据备份文件名>_qp.xb | xbstream -x -v -C  <数据库恢复到这个目录>
    
    --MySQL 5.6/5.7解压
    innobackupex --decompress --remove-original  <数据库恢复到这个目录>
    
    --MySQL 8.0解压
    xtrabackup --decompress --remove-original --target-dir=<数据库恢复到这个目录>

**注意：**

由于阿里云RDS数据库备份的是物理全备文件，所以最好是恢复数据至新安装的Mysql数据库。

\-C：指定文件要解压到的目录。可选参数，若不指定就解压到当前目录。

[root@test2 ~]# tar -izxvf crmdb/hins8537769_data_20200708132950.tar -C /var/lib/mysql
    crmdb/weixin_textmsg.ibd
    crmdb/sys_dept.ibd
    crmdb/ybc_recovery.ibd
    crmdb/sys_user_qx.ibd
    crmdb/imptable.ibd
    crmdb/ybc_refund.ibd
    crmdb/ybt_type.ibd
    crmdb/work_count.ibd
    crmdb/ybc_branch.ibd
    crmdb/ybc_follow.ibd
    crmdb/weixin_command.ibd
    crmdb/sys_user.ibd
    crmdb/version_message.ibd
    crmdb/sys_menu.ibd
    crmdb/sys_app_user.ibd
    crmdb/vip_visit.ibd
    crmdb/ybc_house.ibd
    crmdb/ybc_message.ibd
    crmdb/sys_dictionaries.ibd
    ...
    
    [root@test2 ~]# ls -l /var/lib/mysql     //查询解压后生成的文件
    总用量 324852
    -rw-r----- 1 mysql mysql        56 7月  10 16:41 auto.cnf
    -rw-rw---- 1 root  root        536 7月   8 13:31 backup-my.cnf
    -rw------- 1 mysql mysql      1680 7月  10 16:41 ca-key.pem
    -rw-r--r-- 1 mysql mysql      1112 7月  10 16:41 ca.pem
    -rw-r--r-- 1 mysql mysql      1112 7月  10 16:41 client-cert.pem
    -rw------- 1 mysql mysql      1680 7月  10 16:41 client-key.pem
    drwxr-xr-x 2 root  root       4096 7月  10 16:48 crmdb
    drwxr-xr-x 2 root  root       4096 7月  10 16:48 crmdb_test
    -rw-r----- 1 mysql mysql       425 7月  10 16:41 ib_buffer_pool
    -rw-rw---- 1 root  root  209715200 7月   8 12:31 ibdata1
    -rw-r----- 1 mysql mysql  50331648 7月  10 16:41 ib_logfile0
    -rw-r----- 1 mysql mysql  50331648 7月  10 16:41 ib_logfile1
    -rw-r----- 1 mysql mysql  12582912 7月  10 16:41 ibtmp1
    drwxr-x--- 2 mysql mysql      4096 7月  10 16:48 mysql
    srwxrwxrwx 1 mysql mysql         0 7月  10 16:41 mysql.sock
    -rw------- 1 mysql mysql         5 7月  10 16:41 mysql.sock.lock
    drwxr-x--- 2 mysql mysql      8192 7月  10 16:48 performance_schema
    -rw------- 1 mysql mysql      1680 7月  10 16:41 private_key.pem
    -rw-r--r-- 1 mysql mysql       452 7月  10 16:41 public_key.pem
    -rw-r--r-- 1 mysql mysql      1112 7月  10 16:41 server-cert.pem
    -rw------- 1 mysql mysql      1680 7月  10 16:41 server-key.pem
    drwxr-x--- 2 mysql mysql      8192 7月  10 16:48 sys
    -rw-rw---- 1 root  root        119 7月   8 13:31 xtrabackup_binlog_info
    -rw-rw---- 1 root  root        147 7月   8 13:31 xtrabackup_checkpoints
    -rw-rw---- 1 root  root        845 7月   8 13:31 xtrabackup_info
    -rw-rw---- 1 root  root    9566720 7月   8 13:31 xtrabackup_logfile
    -rw-rw---- 1 root  root         74 7月   8 13:31 xtrabackup_slave_filename_info
    -rw-rw---- 1 root  root        162 7月   8 13:31 xtrabackup_slave_info

**13.安装Percona XtraBackup 2.4（Mysql 5.7需要），恢复备份数据**

[root@test2 ~]# yum -y install https://repo.percona.com/yum/percona-release-latest.noarch.rpm
    ...
    已安装:
      percona-release.noarch 0:1.0-21
    
    完毕！
    
    [root@test2 ~]# yum list | grep percona
    ...
    percona-release.noarch                   1.0-21                        installed
    percona-xtrabackup-24.x86_64             2.4.5-1.el7                   installed
    Percona-Server-55-debuginfo.x86_64       5.5.62-rel38.14.el7           percona-release-x86_64
    Percona-Server-56-debuginfo.x86_64       5.6.48-rel88.0.1.el7          percona-release-x86_64
    Percona-Server-57-debuginfo.x86_64       5.7.30-33.1.el7               percona-release-x86_64
    Percona-Server-80-info.x86_64            8.0-1.el7                     percona-release-x86_64
    Percona-Server-MongoDB.x86_64            3.0.15-1.10.el7               percona-release-x86_64
    Percona-Server-MongoDB-32.x86_64         3.2.22-3.13.el7               percona-release-x86_64
                                             3.2.22-3.13.el7               percona-release-x86_64
    Percona-Server-MongoDB-32-mongos.x86_64  3.2.22-3.13.el7               percona-release-x86_64
    Percona-Server-MongoDB-32-server.x86_64  3.2.22-3.13.el7               percona-release-x86_64
    Percona-Server-MongoDB-32-shell.x86_64   3.2.22-3.13.el7               percona-release-x86_64
    Percona-Server-MongoDB-32-tools.x86_64   3.2.22-3.13.el7               percona-release-x86_64
    Percona-Server-MongoDB-34.x86_64         3.4.24-3.0.el7                percona-release-x86_64
                                             3.4.24-3.0.el7                percona-release-x86_64
    Percona-Server-MongoDB-34-mongos.x86_64  3.4.24-3.0.el7                percona-release-x86_64
    ...
    
    [root@test2 ~]# yum -y install percona-xtrabackup-24.x86_64
    ...
    已安装:
      percona-xtrabackup-24.x86_64 0:2.4.20-1.el7
    
    完毕！

14.为避免版本问题，需修改backup-my.cnf参数

[root@test2 ~]# vim /var/lib/mysql/backup-my.cnf
    [mysqld]
    innodb_checksum_algorithm=crc32
    #innodb_log_checksum_algorithm=strict_crc32         //注释掉
    innodb_data_file_path=ibdata1:200M:autoextend
    innodb_log_files_in_group=2
    innodb_log_file_size=1048576000
    #innodb_fast_checksum=false       //注释掉
    innodb_page_size=16384
    #innodb_log_block_size=512       //注释掉
    innodb_undo_directory=./
    innodb_undo_tablespaces=0
    server_id=2931342899
    #redo_log_version=1         //注释掉
    #server_uuid=cf7b6786-a55c-11e9-94b7-506b4b231e40       //注释掉
    #master_key_id=0       //注释掉
    #innodb_encrypt_algorithm=AES_256_CBC     //注释掉

15.执行如下命令，恢复解压好的备份文件并修改文件属主，并确定文件所属为MySQL用户。

Mysql5.6/5.7/8.0恢复数据时，backup-my.cnf配置文件为上面RDS备份文件解压后的目录中（即，要恢复的文件夹中），本文中数据恢复至/var/lib/mysql/中，Mysql 5.7为刚安装的新库，无任何数据。

**–MySQL 5.6/5.7–**

innobackupex --defaults-file=<数据库恢复到的目录>/backup-my.cnf --apply-log <数据库恢复到的目录>

**–MySQL 8.0–**

xtrabackup --prepare --target-dir=<数据库恢复到的目录>

xtrabackup --datadir=/var/lib/mysql --copy-back --target-dir=<数据库恢复到的目录>

[root@test2 ~]# chown -R mysql:mysql /var/lib/mysql        //修改文件属主属组
    
    [root@test2 ~]# ll /var/lib/mysql
    总用量 2278460
    -rw-r----- 1 mysql mysql         56 7月  10 16:41 auto.cnf
    -rw-rw---- 1 mysql mysql        543 7月  10 16:50 backup-my.cnf
    -rw------- 1 mysql mysql       1680 7月  10 16:41 ca-key.pem
    -rw-r--r-- 1 mysql mysql       1112 7月  10 16:41 ca.pem
    -rw-r--r-- 1 mysql mysql       1112 7月  10 16:41 client-cert.pem
    -rw------- 1 mysql mysql       1680 7月  10 16:41 client-key.pem
    drwxr-xr-x 2 mysql mysql       4096 7月  10 17:26 crmdb
    drwxr-xr-x 2 mysql mysql       4096 7月  10 16:48 crmdb_test
    -rw-r----- 1 mysql mysql        425 7月  10 16:41 ib_buffer_pool
    -rw-rw---- 1 mysql mysql  209715200 7月  10 17:39 ibdata1
    -rw-r----- 1 mysql mysql 1048576000 7月  10 17:39 ib_logfile0
    -rw-r----- 1 mysql mysql 1048576000 7月  10 17:39 ib_logfile1
    -rw-r----- 1 mysql mysql   12582912 7月  10 17:39 ibtmp1
    drwxr-x--- 2 mysql mysql       4096 7月  10 16:48 mysql
    srwxrwxrwx 1 mysql mysql          0 7月  10 16:41 mysql.sock
    -rw------- 1 mysql mysql          5 7月  10 16:41 mysql.sock.lock
    drwxr-x--- 2 mysql mysql       8192 7月  10 16:48 performance_schema
    -rw------- 1 mysql mysql       1680 7月  10 16:41 private_key.pem
    -rw-r--r-- 1 mysql mysql        452 7月  10 16:41 public_key.pem
    -rw-r--r-- 1 mysql mysql       1112 7月  10 16:41 server-cert.pem
    -rw------- 1 mysql mysql       1680 7月  10 16:41 server-key.pem
    drwxr-x--- 2 mysql mysql       8192 7月  10 16:48 sys
    -rw-rw---- 1 mysql mysql        119 7月   8 13:31 xtrabackup_binlog_info
    -rw-r--r-- 1 mysql mysql         24 7月  10 17:38 xtrabackup_binlog_pos_innodb
    -rw-rw---- 1 mysql mysql        147 7月  10 17:38 xtrabackup_checkpoints
    -rw-rw---- 1 mysql mysql        845 7月   8 13:31 xtrabackup_info
    -rw-rw---- 1 mysql mysql   13565952 7月  10 17:38 xtrabackup_logfile
    -rw-r--r-- 1 mysql mysql          1 7月  10 17:38 xtrabackup_master_key_id
    -rw-rw---- 1 mysql mysql         74 7月   8 13:31 xtrabackup_slave_filename_info
    -rw-rw---- 1 mysql mysql        162 7月   8 13:31 xtrabackup_slave_info
    
    [root@test2 ~]# innobackupex --defaults-file=/var/lib/mysql/backup-my.cnf --apply-log /var/lib/mysql
    xtrabackup: recognized server arguments: --innodb_checksum_algorithm=crc32 --innodb_data_file_path=ibdata1:200M:autoextend --innodb_log_files_in_group=2 --innodb_log_file_size=1048576000 --innodb_page_size=16384 --innodb_undo_directory=./ --innodb_undo_tablespaces=0 --server-id=2931342899
    xtrabackup: recognized client arguments:
    200710 17:38:03 innobackupex: Starting the apply-log operation
    
    IMPORTANT: Please check that the apply-log run completes successfully.
               At the end of a successful apply-log run innobackupex
               prints "completed OK!".
    
    innobackupex version 2.4.20 based on MySQL server 5.7.26 Linux (x86_64) (revision id: c8b4056)
    xtrabackup: cd to /var/lib/mysql/
    xtrabackup: This target seems to be not prepared yet.
    InnoDB: Number of pools: 1
    xtrabackup: xtrabackup_logfile detected: size=13565952, start_lsn=(10489267059)
    xtrabackup: using the following InnoDB configuration for recovery:
    xtrabackup:   innodb_data_home_dir = .
    xtrabackup:   innodb_data_file_path = ibdata1:200M:autoextend
    xtrabackup:   innodb_log_group_home_dir = .
    xtrabackup:   innodb_log_files_in_group = 1
    xtrabackup:   innodb_log_file_size = 13565952
    xtrabackup: using the following InnoDB configuration for recovery:
    xtrabackup:   innodb_data_home_dir = .
    xtrabackup:   innodb_data_file_path = ibdata1:200M:autoextend
    xtrabackup:   innodb_log_group_home_dir = .
    xtrabackup:   innodb_log_files_in_group = 1
    xtrabackup:   innodb_log_file_size = 13565952
    xtrabackup: Starting InnoDB instance for recovery.
    xtrabackup: Using 104857600 bytes for buffer pool (set by --use-memory parameter)
    InnoDB: PUNCH HOLE support available
    InnoDB: Mutexes and rw_locks use GCC atomic builtins
    InnoDB: Uses event mutexes
    InnoDB: GCC builtin __atomic_thread_fence() is used for memory barrier
    InnoDB: Compressed tables use zlib 1.2.7
    InnoDB: Number of pools: 1
    InnoDB: Using CPU crc32 instructions
    InnoDB: Initializing buffer pool, total size = 100M, instances = 1, chunk size = 100M
    InnoDB: Completed initialization of buffer pool
    InnoDB: page_cleaner coordinator priority: -20
    InnoDB: Highest supported file format is Barracuda.
    InnoDB: Log scan progressed past the checkpoint lsn 10489267059
    InnoDB: Doing recovery: scanned up to log sequence number 10494509568 (43%)
    InnoDB: Doing recovery: scanned up to log sequence number 10498831278 (79%)
    InnoDB: Database was not shutdown normally!
    InnoDB: Starting crash recovery.
    InnoDB: Starting an apply batch of log records to the database...
    InnoDB: Progress in percent: 0 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 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99
    InnoDB: Apply batch completed
    InnoDB: xtrabackup: Last MySQL binlog file position 593541, file name mysql-bin.001448
    InnoDB: Removed temporary tablespace data file: "ibtmp1"
    InnoDB: Creating shared tablespace for temporary tables
    InnoDB: Setting file './ibtmp1' size to 12 MB. Physically writing the file full; Please wait ...
    InnoDB: File './ibtmp1' size is now 12 MB.
    InnoDB: 96 redo rollback segment(s) found. 1 redo rollback segment(s) are active.
    InnoDB: 32 non-redo rollback segment(s) are active.
    InnoDB: Waiting for purge to start
    InnoDB: 5.7.26 started; log sequence number 10498831278
    InnoDB: page_cleaner: 1000ms intended loop took 46390ms. The settings might not be optimal. (flushed=0 and evicted=0, during the time.)
    InnoDB: xtrabackup: Last MySQL binlog file position 593541, file name mysql-bin.001448
    
    xtrabackup: starting shutdown with innodb_fast_shutdown = 1
    InnoDB: FTS optimize thread exiting.
    InnoDB: Starting shutdown...
    InnoDB: Shutdown completed; log sequence number 10498832727
    InnoDB: Number of pools: 1
    xtrabackup: using the following InnoDB configuration for recovery:
    xtrabackup:   innodb_data_home_dir = .
    xtrabackup:   innodb_data_file_path = ibdata1:200M:autoextend
    xtrabackup:   innodb_log_group_home_dir = .
    xtrabackup:   innodb_log_files_in_group = 2
    xtrabackup:   innodb_log_file_size = 1048576000
    InnoDB: PUNCH HOLE support available
    InnoDB: Mutexes and rw_locks use GCC atomic builtins
    InnoDB: Uses event mutexes
    InnoDB: GCC builtin __atomic_thread_fence() is used for memory barrier
    InnoDB: Compressed tables use zlib 1.2.7
    InnoDB: Number of pools: 1
    InnoDB: Using CPU crc32 instructions
    InnoDB: Initializing buffer pool, total size = 100M, instances = 1, chunk size = 100M
    InnoDB: Completed initialization of buffer pool
    InnoDB: page_cleaner coordinator priority: -20
    InnoDB: Setting log file ./ib_logfile101 size to 1000 MB
    InnoDB: Progress in MB:
     100 200 300 400 500 600 700 800 900 1000
    InnoDB: Setting log file ./ib_logfile1 size to 1000 MB
    InnoDB: Progress in MB:
     100 200 300 400 500 600 700 800 900 1000
    InnoDB: Renaming log file ./ib_logfile101 to ./ib_logfile0
    InnoDB: New log files created, LSN=10498832727
    InnoDB: Highest supported file format is Barracuda.
    InnoDB: Log scan progressed past the checkpoint lsn 10498832908
    InnoDB: Doing recovery: scanned up to log sequence number 10498832917 (0%)
    InnoDB: Database was not shutdown normally!
    InnoDB: Starting crash recovery.
    InnoDB: xtrabackup: Last MySQL binlog file position 593541, file name mysql-bin.001448
    InnoDB: Removed temporary tablespace data file: "ibtmp1"
    InnoDB: Creating shared tablespace for temporary tables
    InnoDB: Setting file './ibtmp1' size to 12 MB. Physically writing the file full; Please wait ...
    InnoDB: File './ibtmp1' size is now 12 MB.
    InnoDB: 96 redo rollback segment(s) found. 1 redo rollback segment(s) are active.
    InnoDB: 32 non-redo rollback segment(s) are active.
    InnoDB: page_cleaner: 1000ms intended loop took 35376ms. The settings might not be optimal. (flushed=0 and evicted=0, during the time.)
    InnoDB: 5.7.26 started; log sequence number 10498832917
    xtrabackup: starting shutdown with innodb_fast_shutdown = 1
    InnoDB: FTS optimize thread exiting.
    InnoDB: Starting shutdown...
    InnoDB: Shutdown completed; log sequence number 10498832936
    200710 17:39:28 completed OK!

可以看到执行 innobackupex 恢复数据成功了。

注意：
    
     数据恢复成功后，由于我们是恢复的RDS全备文件，所以我们自建的Mysql数据库之前设置的密码会被覆盖成RDS的备份数据库的密码，如果忘记密码，可以临时在Mysql配置文件中加入skip-grant-tables配置，无密码进入数据库，验证数据恢复情况，后面再重置root密码。

\[root@test2 ~\]\# vim /etc/my.cnf

\[mysqld\]  
…  
skip-grant-tables

**16.执行如下命令，启动MySQL进程。**

注意：

在启动Mysql进程的时候，由于我是直接将备份数据恢复到Mysql默认的数据库目录/var/lib/mysql中，所以可以直接systemctl start mysqld启动Mysql进程。如果最开始是将RDS数据库的备份文件恢复到了其他目录中，那么在启动Mysql数据库进程的时候就需要使用mysqld\_safe指定数据库目录启动进程，否则默认方式启动数据库后是看不到恢复的数据的。

命令：

可以看到数据成功展示，数据恢复成功！！！

`重置连接Mysql数据库的Root密码`

# 密码重置报错解决： #

关于将阿里云RDS数据库或其他主机数据库全备文件恢复至自建数据库后密码被覆盖，并在重置密码时出现各种报错的问题解决

1.修改配置文件，添加跳过授权表配置启动MySQL服务

[root@test2 ~]# vim /etc/my.cnf
    
    [mysqld]
    ...
    skip-grant-tables

2.重启Mysql服务进程后登陆数据库修改root密码

[root@test2 ~]# systemctl restart mysqld 
    
    [root@test2 ~]# mysql -uroot
    mysql> use mysql;
    
    mysql> update user set authentication_string=password('123qqq...A') where user='root' and host='%';
    
    mysql> flush privileges;
    
    mysql> exit
    Bye
    
    [root@test2 ~]# sed -i s/skip-grant-tables//g /etc/my.cnf
    
    [root@test2 ~]# systemctl restart mysqld
    
    [root@test2 ~]# mysql -uroot -p123qqq...A
    mysql> select user();
    +--------+
    | user() |
    +--------+
    | root@  |
    +--------+
    1 row in set (0.00 sec)

重置数据库密码成功！

# `其他相关报错解决：` #

1.安装Mysql报错：错误：软件包：mysql-community-server-5.7.30-1.el7.x86\_64 (mysql57-community) 需要：mysql-community解决

2.安装percona-xtrabackup-24报错：file /etc/my.cnf from install of Percona-Server-shared-56-5.6.48-rel88.解决

3.阿里云数据库RDS MySQL 物理全备文件恢复到自建数据库Mysql报错：InnoDB: Log file ./ib\_logfile1 is of different size…xtrabacku

https://mp.weixin.qq.com/s/hRU-8SNJKnerJv0s8PbMdA

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