记一次MySQL5初始化被kill的问题排查 | 京东云技术团队

2023年 10月 17日 43.1k 0

写在前面

由于测试环境JED申请比较繁琐,所以Eone提供了单机版Mysql供用户使用,近期Eone搭建Mysql5的时候发现莫名被kill了,容器规格是4C8G,磁盘30G

这不科学,之前都是可以的,镜像没变,配置没变,咋就不行了呢,一定不是我的问题,是机器的问题

问题排查

重现

通过多次搭建mysql5进行采样,发现并不是稳定复现,有一些容器是可以正常启动提供服务的,找到被mysql服务被kill的容器日志,发现是MySQL初始化被kill了,

/usr/local/mysql/bin/mysqld --defaults-file=/etc/my.cnf --basedir=/usr/local/mysql --datadir=/export/data/mysql/data --user=admin --initialize-insecure

mysql配置文件:

[client]
socket=/tmp/mysql.sock

[mysqld]
basedir=/usr/local/mysql
datadir=/export/data/mysql/data
port=3306
server_id=1
socket=/tmp/mysql.sock
log-error=/tmp/mysqld.err
pid-file=/tmp/mysqld.pid

skip-host-cache
skip-name-resolve
skip-grant-tables

问题排查

初始化为什么被kill?

手动执行了下初始化的命令,发现直接被kill了

通过dmesg命令发现,貌似oom了

纳尼?怎么用了这么多内存?容器都没这么大内存诶

通过排查,发现MySQL有一个8G的匿名内存,这是哪来的???

将容器规格调整为32G内存,再次尝试,发现成功启动了,但是内存占用貌似不太正常

这不科学,正常的容器内存使用情况是这样的👇

MySQL配置不合理?

难道是因为mysql设置的大小不合理?默认不设置innodb_buffer_pool_size按理说应该是128M才对,抱着侥幸心理设置下试下

然而问题依旧,改了配置也没有效果,看来不是配置的问题

真是机器的问题?

对比了一下正常启动的机器,拿着ip找到运维,发现异常的机器是近期添加的云舰系统的机器,之前centos系统宿主机是正常的,新加的云舰系统宿主机都是异常的,看来真是机器的问题,这两台机器有啥差别呢,接下来运维同学开启了排查之路:

  • 首先,看看两台宿主机是不是物理CPU总数不一样

  • 再确认下CentOS是否开启了富容器功能

  • 对比了下两台宿主机的资源配置,发现好像是资源配置的问题

    正常的机器配置是这样的

    或许真的有可能,修改下open files限制再试下

    ulimit -n 1048576

    竟然可以了!!!MySQL正常提供服务了,真的是机器的问题

    image.png

    问题分析

    strace log分析

    28139 execve("/usr/local/mysql/bin/mysqld-debug", ["/usr/local/mysql/bin/mysqld-debu"..., "--initialize-insecure", "--basedir=/usr/local/mysql", "--datadir=/export/data/mysql/dat"..., "--user=admin"], 0x7ffe74bdcbe8 /* 294 vars */) = 0
    28139 brk(NULL)                         = 0x4b50000
    28139 mmap(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7f93d3bf6000
    28139 access("/etc/ld.so.preload", R_OK) = -1 ENOENT (No such file or directory)
    28139 open("/etc/ld.so.cache", O_RDONLY|O_CLOEXEC) = 3
    28139 fstat(3, {st_mode=S_IFREG|0644, st_size=16580, ...}) = 0
    28139 mmap(NULL, 16580, PROT_READ, MAP_PRIVATE, 3, 0) = 0x7f93d3bf1000
    28139 close(3)                          = 0
    28139 open("/lib64/libpthread.so.0", O_RDONLY|O_CLOEXEC) = 3
    28139 read(3, "177ELF2113>1240l"..., 832) = 832
    28139 fstat(3, {st_mode=S_IFREG|0755, st_size=142304, ...}) = 0
    28139 mmap(NULL, 2208864, PROT_READ|PROT_EXEC, MAP_PRIVATE|MAP_DENYWRITE, 3, 0) = 0x7f93d37ba000
    28139 mprotect(0x7f93d37d0000, 2097152, PROT_NONE) = 0
    28139 mmap(0x7f93d39d0000, 8192, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED|MAP_DENYWRITE, 3, 0x16000) = 0x7f93d39d0000
    28139 mmap(0x7f93d39d2000, 13408, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED|MAP_ANONYMOUS, -1, 0) = 0x7f93d39d2000
    28139 close(3)                          = 0
    28139 open("/lib64/libdl.so.2", O_RDONLY|O_CLOEXEC) = 3
    28139 read(3, "177ELF2113>132016"..., 832) = 832
    28139 fstat(3, {st_mode=S_IFREG|0755, st_size=19520, ...}) = 0
    28139 mmap(NULL, 2109744, PROT_READ|PROT_EXEC, MAP_PRIVATE|MAP_DENYWRITE, 3, 0) = 0x7f93d35b6000
    28139 mprotect(0x7f93d35b9000, 2093056, PROT_NONE) = 0
    28139 mmap(0x7f93d37b8000, 8192, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED|MAP_DENYWRITE, 3, 0x2000) = 0x7f93d37b8000
    28139 close(3)                          = 0
    28139 open("/lib64/libaio.so.1", O_RDONLY|O_CLOEXEC) = 3
    28139 read(3, "177ELF2113>12405"..., 832) = 832
    28139 fstat(3, {st_mode=S_IFREG|0755, st_size=6264, ...}) = 0
    28139 mmap(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7f93d3bf0000
    28139 mmap(NULL, 2101328, PROT_READ|PROT_EXEC, MAP_PRIVATE|MAP_DENYWRITE, 3, 0) = 0x7f93d33b4000
    28139 mprotect(0x7f93d33b5000, 2093056, PROT_NONE) = 0
    28139 mmap(0x7f93d35b4000, 8192, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED|MAP_DENYWRITE, 3, 0) = 0x7f93d35b4000
    28139 close(3)                          = 0
    28139 open("/lib64/libnuma.so.1", O_RDONLY|O_CLOEXEC) = 3
    28139 read(3, "177ELF2113>1004"..., 832) = 832
    28139 fstat(3, {st_mode=S_IFREG|0755, st_size=50704, ...}) = 0
    28139 mmap(NULL, 2144448, PROT_READ|PROT_EXEC, MAP_PRIVATE|MAP_DENYWRITE, 3, 0) = 0x7f93d31a8000
    28139 mprotect(0x7f93d31b2000, 2097152, PROT_NONE) = 0
    28139 mmap(0x7f93d33b2000, 8192, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED|MAP_DENYWRITE, 3, 0xa000) = 0x7f93d33b2000
    28139 close(3)                          = 0
    28139 open("/lib64/libcrypt.so.1", O_RDONLY|O_CLOEXEC) = 3
    28139 read(3, "177ELF2113>130016"..., 832) = 832
    28139 fstat(3, {st_mode=S_IFREG|0755, st_size=40816, ...}) = 0
    28139 mmap(NULL, 2318912, PROT_READ|PROT_EXEC, MAP_PRIVATE|MAP_DENYWRITE, 3, 0) = 0x7f93d2f71000
    28139 mprotect(0x7f93d2f79000, 2093056, PROT_NONE) = 0
    28139 mmap(0x7f93d3178000, 8192, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED|MAP_DENYWRITE, 3, 0x7000) = 0x7f93d3178000
    28139 mmap(0x7f93d317a000, 184896, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED|MAP_ANONYMOUS, -1, 0) = 0x7f93d317a000
    28139 close(3)                          = 0
    28139 open("/lib64/librt.so.1", O_RDONLY|O_CLOEXEC) = 3
    28139 read(3, "177ELF21133>1300""..., 832) = 832
    28139 fstat(3, {st_mode=S_IFREG|0755, st_size=44096, ...}) = 0
    28139 mmap(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7f93d3bef000
    28139 mmap(NULL, 2128952, PROT_READ|PROT_EXEC, MAP_PRIVATE|MAP_DENYWRITE, 3, 0) = 0x7f93d2d69000
    28139 mprotect(0x7f93d2d70000, 2093056, PROT_NONE) = 0
    28139 mmap(0x7f93d2f6f000, 8192, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED|MAP_DENYWRITE, 3, 0x6000) = 0x7f93d2f6f000
    28139 close(3)                          = 0
    28139 open("/lib64/libstdc++.so.6", O_RDONLY|O_CLOEXEC) = 3
    28139 read(3, "177ELF21133>13402645"..., 832) = 832
    28139 fstat(3, {st_mode=S_IFREG|0755, st_size=995840, ...}) = 0
    28139 mmap(NULL, 3175456, PROT_READ|PROT_EXEC, MAP_PRIVATE|MAP_DENYWRITE, 3, 0) = 0x7f93d2a61000
    28139 mprotect(0x7f93d2b4a000, 2097152, PROT_NONE) = 0
    28139 mmap(0x7f93d2d4a000, 40960, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED|MAP_DENYWRITE, 3, 0xe9000) = 0x7f93d2d4a000
    28139 mmap(0x7f93d2d54000, 82976, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED|MAP_ANONYMOUS, -1, 0) = 0x7f93d2d54000
    28139 close(3)                          = 0
    28139 open("/lib64/libm.so.6", O_RDONLY|O_CLOEXEC) = 3
    28139 read(3, "177ELF21133>1260T"..., 832) = 832
    28139 fstat(3, {st_mode=S_IFREG|0755, st_size=1141560, ...}) = 0
    28139 mmap(NULL, 3150168, PROT_READ|PROT_EXEC, MAP_PRIVATE|MAP_DENYWRITE, 3, 0) = 0x7f93d275f000
    28139 mprotect(0x7f93d2860000, 2093056, PROT_NONE) = 0
    28139 mmap(0x7f93d2a5f000, 8192, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED|MAP_DENYWRITE, 3, 0x100000) = 0x7f93d2a5f000
    28139 close(3)                          = 0
    28139 open("/lib64/libgcc_s.so.1", O_RDONLY|O_CLOEXEC) = 3
    28139 read(3, "177ELF2113>1320*"..., 832) = 832
    28139 fstat(3, {st_mode=S_IFREG|0755, st_size=88720, ...}) = 0
    28139 mmap(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7f93d3bee000
    28139 mmap(NULL, 2184192, PROT_READ|PROT_EXEC, MAP_PRIVATE|MAP_DENYWRITE, 3, 0) = 0x7f93d2549000
    28139 mprotect(0x7f93d255e000, 2093056, PROT_NONE) = 0
    28139 mmap(0x7f93d275d000, 8192, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED|MAP_DENYWRITE, 3, 0x14000) = 0x7f93d275d000
    28139 close(3)                          = 0
    28139 open("/lib64/libc.so.6", O_RDONLY|O_CLOEXEC) = 3
    28139 read(3, "177ELF21133>1 342"..., 832) = 832
    28139 fstat(3, {st_mode=S_IFREG|0755, st_size=2112384, ...}) = 0
    28139 mmap(NULL, 3936832, PROT_READ|PROT_EXEC, MAP_PRIVATE|MAP_DENYWRITE, 3, 0) = 0x7f93d2187000
    28139 mprotect(0x7f93d233e000, 2097152, PROT_NONE) = 0
    28139 mmap(0x7f93d253e000, 24576, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED|MAP_DENYWRITE, 3, 0x1b7000) = 0x7f93d253e000
    28139 mmap(0x7f93d2544000, 16960, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED|MAP_ANONYMOUS, -1, 0) = 0x7f93d2544000
    28139 close(3)                          = 0
    28139 open("/lib64/libfreebl3.so", O_RDONLY|O_CLOEXEC) = 3
    28139 read(3, "177ELF2113>1240v"..., 832) = 832
    28139 fstat(3, {st_mode=S_IFREG|0755, st_size=11376, ...}) = 0
    28139 mmap(NULL, 2105536, PROT_READ|PROT_EXEC, MAP_PRIVATE|MAP_DENYWRITE, 3, 0) = 0x7f93d1f84000
    28139 mprotect(0x7f93d1f86000, 2093056, PROT_NONE) = 0
    28139 mmap(0x7f93d2185000, 8192, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED|MAP_DENYWRITE, 3, 0x1000) = 0x7f93d2185000
    28139 close(3)                          = 0
    28139 mmap(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7f93d3bed000
    28139 mmap(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7f93d3bec000
    28139 mmap(NULL, 8192, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7f93d3bea000
    28139 arch_prctl(ARCH_SET_FS, 0x7f93d3bea740) = 0
    28139 mprotect(0x7f93d253e000, 16384, PROT_READ) = 0
    28139 mprotect(0x7f93d37b8000, 4096, PROT_READ) = 0
    28139 mprotect(0x7f93d2185000, 4096, PROT_READ) = 0
    28139 mprotect(0x7f93d275d000, 4096, PROT_READ) = 0
    28139 mprotect(0x7f93d2a5f000, 4096, PROT_READ) = 0
    28139 mmap(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7f93d3be9000
    28139 mprotect(0x7f93d2d4a000, 32768, PROT_READ) = 0
    28139 mprotect(0x7f93d39d0000, 4096, PROT_READ) = 0
    28139 mprotect(0x7f93d2f6f000, 4096, PROT_READ) = 0
    28139 mprotect(0x7f93d3178000, 4096, PROT_READ) = 0
    28139 mprotect(0x7f93d33b2000, 4096, PROT_READ) = 0
    28139 mprotect(0x7f93d35b4000, 4096, PROT_READ) = 0
    28139 mmap(NULL, 8192, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7f93d3be7000
    28139 mprotect(0x7f93d3bf7000, 4096, PROT_READ) = 0
    28139 munmap(0x7f93d3bf1000, 16580)     = 0
    28139 set_tid_address(0x7f93d3beaa10)   = 28139
    28139 set_robust_list(0x7f93d3beaa20, 24) = 0
    28139 rt_sigaction(SIGRTMIN, {sa_handler=0x7f93d37c0780, sa_mask=[], sa_flags=SA_RESTORER|SA_SIGINFO, sa_restorer=0x7f93d37c9100}, NULL, 8) = 0
    28139 rt_sigaction(SIGRT_1, {sa_handler=0x7f93d37c0810, sa_mask=[], sa_flags=SA_RESTORER|SA_RESTART|SA_SIGINFO, sa_restorer=0x7f93d37c9100}, NULL, 8) = 0
    28139 rt_sigprocmask(SIG_UNBLOCK, [RTMIN RT_1], NULL, 8) = 0
    28139 getrlimit(RLIMIT_STACK, {rlim_cur=8192*1024, rlim_max=RLIM64_INFINITY}) = 0
    28139 brk(NULL)                         = 0x4b50000
    28139 brk(0x4b71000)                    = 0x4b71000
    28139 open("/proc/self/status", O_RDONLY) = 3
    28139 fstat(3, {st_mode=S_IFREG|0444, st_size=0, ...}) = 0
    28139 mmap(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7f93d3bf5000
    28139 read(3, "Name:tmysqld-debugnUmask:t0022nS"..., 1024) = 1024
    28139 read(3, "0,00000000,00000000,00000000,000"..., 1024) = 334
    28139 close(3)                          = 0
    28139 munmap(0x7f93d3bf5000, 4096)      = 0
    28139 openat(AT_FDCWD, "/sys/devices/system/node", O_RDONLY|O_NONBLOCK|O_CLOEXEC|O_DIRECTORY) = 3
    28139 getdents(3, /* 11 entries */, 32768) = 360
    28139 open("/sys/devices/system/node/node0/meminfo", O_RDONLY) = 4
    28139 fstat(4, {st_mode=S_IFREG|0444, st_size=4096, ...}) = 0
    28139 mmap(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7f93d3bf5000
    28139 read(4, "Node 0 MemTotal:       226242196"..., 4096) = 1175
    28139 stat("/etc/sysconfig/64bit_strstr_via_64bit_strstr_sse2_unaligned", 0x7ffda2f609d0) = -1 ENOENT (No such file or directory)
    28139 stat("/etc/sysconfig/64bit_strstr_via_64bit_strstr_sse2_unaligned", 0x7ffda2f609d0) = -1 ENOENT (No such file or directory)
    28139 read(4, "", 4096)                 = 0
    28139 close(4)                          = 0
    28139 munmap(0x7f93d3bf5000, 4096)      = 0
    28139 getdents(3, /* 0 entries */, 32768) = 0
    28139 close(3)                          = 0
    28139 sched_getaffinity(0, 512, [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]) = 8
    28139 openat(AT_FDCWD, "/sys/devices/system/cpu", O_RDONLY|O_NONBLOCK|O_CLOEXEC|O_DIRECTORY) = 3
    28139 getdents(3, /* 77 entries */, 32768) = 2368
    28139 getdents(3, /* 0 entries */, 32768) = 0
    28139 close(3)                          = 0
    28139 open("/proc/self/status", O_RDONLY) = 3
    28139 fstat(3, {st_mode=S_IFREG|0444, st_size=0, ...}) = 0
    28139 mmap(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7f93d3bf5000
    28139 read(3, "Name:tmysqld-debugnUmask:t0022nS"..., 1024) = 1024
    28139 read(3, "0,00000000,00000000,00000000,000"..., 1024) = 334
    28139 read(3, "", 1024)                 = 0
    28139 close(3)                          = 0
    28139 munmap(0x7f93d3bf5000, 4096)      = 0
    28139 futex(0x7f93d2d6696c, FUTEX_WAKE_PRIVATE, 2147483647) = 0
    28139 futex(0x7f93d2d66978, FUTEX_WAKE_PRIVATE, 2147483647) = 0
    28139 stat("/etc/my.cnf", {st_mode=S_IFREG|0644, st_size=370, ...}) = 0
    28139 open("/etc/my.cnf", O_RDONLY)     = 3
    28139 fstat(3, {st_mode=S_IFREG|0644, st_size=370, ...}) = 0
    28139 mmap(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7f93d3bf5000
    28139 read(3, "[client]nsocket=/tmp/mysql.sockn"..., 4096) = 370
    28139 read(3, "", 4096)                 = 0
    28139 close(3)                          = 0
    28139 munmap(0x7f93d3bf5000, 4096)      = 0
    28139 stat("/etc/mysql/my.cnf", 0x7ffda2f5c8d0) = -1 ENOENT (No such file or directory)
    28139 stat("/usr/local/mysql/etc/my.cnf", 0x7ffda2f5c8d0) = -1 ENOENT (No such file or directory)
    28139 stat("/root/.my.cnf", 0x7ffda2f5c8d0) = -1 ENOENT (No such file or directory)
    28139 getrlimit(RLIMIT_NOFILE, {rlim_cur=1073741816, rlim_max=1073741816}) = 0
    28139 mmap(NULL, 17179869184, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7f8fd1f84000
    28139 +++ killed by SIGKILL +++
    

    可以看到最后用 mmap 一次分配了 16G 内存,然后就被杀了。

    mmap 前调用了 getrlimit , 猜测是 mysql 会根据系统资源限制来分配内存

    MySQL源码分析

    MySQL 源码中直接调用 getrlimit 的地方不多,排除了 ndb、innodb_memcached、libevent 之后,只有一处直接调用:

    static uint set_max_open_files(uint max_file_limit)
    {
      struct rlimit rlimit;
      uint old_cur;
      DBUG_ENTER("set_max_open_files");
      DBUG_PRINT("enter",("files: %u", max_file_limit));
    
      if (!getrlimit(RLIMIT_NOFILE,&rlimit))
      {
        old_cur= (uint) rlimit.rlim_cur;
        DBUG_PRINT("info", ("rlim_cur: %u  rlim_max: %u",
                            (uint) rlimit.rlim_cur,
                            (uint) rlimit.rlim_max));
        if (rlimit.rlim_cur == (rlim_t) RLIM_INFINITY)
          rlimit.rlim_cur = max_file_limit;
        if (rlimit.rlim_cur >= max_file_limit)
          DBUG_RETURN(rlimit.rlim_cur);                /* purecov: inspected */
        rlimit.rlim_cur= rlimit.rlim_max= max_file_limit;
        if (setrlimit(RLIMIT_NOFILE, &rlimit))
          max_file_limit= old_cur;                        /* Use original value */
        else
        {
          rlimit.rlim_cur= 0;                        /* Safety if next call fails */
          (void) getrlimit(RLIMIT_NOFILE,&rlimit);
          DBUG_PRINT("info", ("rlim_cur: %u", (uint) rlimit.rlim_cur));
          if (rlimit.rlim_cur)                        /* If call didn't fail */
            max_file_limit= (uint) rlimit.rlim_cur;
        }
      }
      DBUG_PRINT("exit",("max_file_limit: %u", max_file_limit));
      DBUG_RETURN(max_file_limit);
    

    其中逻辑是:如果系统的文件打开限制是 RLIM_INFINITY 或者比要设置的 max_file_limit 大,都返回系统的限制。

    这个函数也只被直接调用一次:

    uint my_set_max_open_files(uint files)
    {
      struct st_my_file_info *tmp;
      DBUG_ENTER("my_set_max_open_files");
      DBUG_PRINT("enter",("files: %u  my_file_limit: %u", files, my_file_limit));
    
      files+= MY_FILE_MIN;
      files= set_max_open_files(MY_MIN(files, OS_FILE_LIMIT)); // 获取最大打开文件数
      if (files <= MY_NFILE)
        DBUG_RETURN(files);
    
      // 分配内存
      if (!(tmp= (struct st_my_file_info*) my_malloc(key_memory_my_file_info,
                                                     sizeof(*tmp) * files,
                                                     MYF(MY_WME))))
        DBUG_RETURN(MY_NFILE);
    
      // 初始化
      /* Copy any initialized files */
      memcpy((char*) tmp, (char*) my_file_info,
             sizeof(*tmp) * MY_MIN(my_file_limit, files));
      memset((tmp + my_file_limit), 0,
            MY_MAX((int) (files - my_file_limit), 0) * sizeof(*tmp));
      my_free_open_file_info();                        /* Free if already allocated */
      my_file_info= tmp;
      my_file_limit= files;
      DBUG_PRINT("exit",("files: %u", files));
      DBUG_RETURN(files);
    }
    

    原来 MySQL5 会根据最大可打开文件数,提前为每个文件分配和初始化内存,在这个时候就可能分配过多内存,导致 OOM。MySQL8修复了这个问题。

    解决

    启动前设置ulimit

    ENTRYPOINT ["ulimit -n 1048576 && /home/admin/start.sh"]
    

    写在后面

    在linux中,open files设置过大会出现很多问题,应该合理控制open files数量

    参考文献

    learnku.com/articles/34…

    作者:京东零售 杨云龙

    来源:京东云开发者社区 转载请注明来源

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