elasticsearch启动警告
Unable to lock JVM memory (ENOMEM). This can result in part of the JVM being swapped out. Increase RLIMIT_MEMLOCK (ulimit).
内存锁定值的限制(max locked memory)
这个值只对普通用户起作用,对超级用户不起作用,这个问题是由于CAP_IPC_LOCK造成的.linux对内存是分页管理的,这意味着有不需要时,在物理内存的数据会被换到交换区或磁盘上.有需要时会被交换到物理内存,而将数据锁定到物理内存可以避免数据的换入/换出.采用锁定内存有两个理由:1)由于程序设计上需要,比如oracle等软件,就需要将数据锁定到物理内存.2)主要是安全上的需要,比如用户名和密码等等,被交换到swap或磁盘,有泄密的可能,所以一直将其锁定到物理内存.
查看项目进程限制，17497为pid
cat /proc/17497/limits
查看系统限制ulimit -a
core file size (blocks, -c) unlimited data seg size (kbytes, -d) unlimited scheduling priority (-e) 0 file size (blocks, -f) unlimited pending signals (-i) 1032980 max locked memory (kbytes, -l) 64 max memory size (kbytes, -m) unlimited open files (-n) 600000 pipe size (512 bytes, -p) 8 POSIX message queues (bytes, -q) 819200 real-time priority (-r) 0 stack size (kbytes, -s) unlimited cpu time (seconds, -t) unlimited max user processes (-u) 600000 virtual memory (kbytes, -v) unlimited file locks (-x) unlimited
vim /etc/security/limits.conf增加2行，设为更大的值或者unlimited
其他可以使用ulimit添加自定义的限制（很多选项系统默认未开启），可以对一些不同用户进行限制
# # - core - limits the core file size (KB) # - data - max data size (KB) # - fsize - maximum filesize (KB) # - memlock - max locked-in-memory address space (KB) # - nofile - max number of open files # - rss - max resident set size (KB) # - stack - max stack size (KB) # - cpu - max CPU time (MIN) # - nproc - max number of processes # - as - address space limit (KB) # - maxlogins - max number of logins for this user # - maxsyslogins - max number of logins on the system # - priority - the priority to run user process with # - locks - max number of file locks the user can hold # - sigpending - max number of pending signals # - msgqueue - max memory used by POSIX message queues (bytes) # - nice - max nice priority allowed to raise to values: [-20, 19] # - rtprio - max realtime priority
总结
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