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java服务启动时报错Cannot allocate memory问题解决

在日常巡检中发现某服务器服务无数据,通过查看java服务输出发现如下报错:

OpenJDK 64-Bit Server VM warning: INFO: os::commit_memory(0x0000ffff7cab0000, 65536, 1) failed; error='Cannot allocate memory' (errno=12)
#
# There is insufficient memory for the Java Runtime Environment to continue.
# Native memory allocation (mmap) failed to map 65536 bytes for committing reserved memory.

排查思路

  • 减少系统内存负载
  • 增加物理内存或交换空间
  • 检查交换后备存储是否已满
  • 在 64 位操作系统上使用 64 位 Java
  • 减小 Java 堆大小 ( -Xmx/ -Xms)
  • 减少 Java 线程数
  • 减小 Java 线程堆栈大小 ( -Xss)
  • 设置更大的代码缓存-XX:ReservedCodeCacheSize=
查看内存情况

由此可以看到剩余内存并不多。

[collect@localhost ~]$ free -h
              total        used        free      shared  buff/cache   available
Mem:            62G         53G        4.4G        3.1G        4.6G        863M
Swap:           19G         19G        256K
查看内存占用

通过top命令mem排名可以看到rsyslogd服务占用内存过多

PID USER      PR  NI    VIRT    RES    SHR S  %CPU %MEM     TIME+ COMMAND
14088 root      20   0   68.7g  48.8g  43840 S  20.6 77.5   3933:15 rsyslogd
清理内存占用过多服务
[root@localhost ~]# systemctl status 14088
● rsyslog.service - System Logging Service
   Loaded: loaded (/usr/lib/systemd/system/rsyslog.service; enabled; vendor preset: enabled)
   Active: active (running) since 一 2022-10-17 15:47:10 CST; 1 months 13 days ago
     Docs: man:rsyslogd(8)
           http://www.rsyslog.com/doc/
 Main PID: 14088 (rsyslogd)
    Tasks: 3
   CGroup: /system.slice/rsyslog.service
           └─14088 /usr/sbin/rsyslogd -n
[root@localhost ~]# systemctl restart rsyslog
查看rsyslog服务
[root@localhost ~]# journalctl -u rsyslog
-- Logs begin at 三 2022-11-30 08:33:38 CST, end at 三 2022-11-30 09:37:30 CST. --
11月 30 08:33:38 localhost.localdomain rsyslogd[14088]: sd_journal_get_cursor() failed: 'Cannot assign requested address'  [v8.24.0-34.el7]
11月 30 08:33:38 localhost.localdomain rsyslogd[14088]: imjournal: journal reloaded... [v8.24.0-34.el7 try http://www.rsyslog.com/e/0 ]
11月 30 08:36:32 localhost.localdomain rsyslogd[14088]: sd_journal_get_cursor() failed: 'Cannot assign requested address'  [v8.24.0-34.el7]
11月 30 08:36:32 localhost.localdomain rsyslogd[14088]: imjournal: journal reloaded... [v8.24.0-34.el7 try http://www.rsyslog.com/e/0 ]
11月 30 08:41:53 localhost.localdomain rsyslogd[14088]: imjournal: 317109 messages lost due to rate-limiting
11月 30 08:46:17 localhost.localdomain rsyslogd[14088]: imjournal: begin to drop messages due to rate-limiting
修改rsyslog服务配置

根据实际情况新增或修改MemoryAccountingMemoryMaxMemoryHigh参数进行内存使用限制。

[root@localhost ~]# vi /usr/lib/systemd/system/rsyslog.service
[Unit]
Description=System Logging Service
;Requires=syslog.socket
Wants=network.target network-online.target
After=network.target network-online.target
Documentation=man:rsyslogd(8)
Documentation=http://www.rsyslog.com/doc/

[Service]
Type=notify
EnvironmentFile=-/etc/sysconfig/rsyslog
ExecStart=/usr/sbin/rsyslogd -n $SYSLOGD_OPTIONS
Restart=on-failure
UMask=0066
StandardOutput=null
Restart=on-failure
MemoryAccounting=yes
MemoryMax=100M
MemoryHigh=10M

[Install]
WantedBy=multi-user.target
;Alias=syslog.service
重启rsyslog服务
[root@localhost ~]# systemctl daemon-reload
[root@localhost ~]# systemctl restart rsyslog
新增journal目录

由于不存在/var/log/journal/目录,导致rsyslog服务输出报错,占用大量存储及内存空间。

[root@localhost ~]# mkdir /var/log/journal/

参考文档

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