弹性搜索最大虚拟内存区域vm.max_map_count[65530]太低,至少增加[262144]

我有一个针对ElasticSearch的systemd配置的问题.

[Unit]
Description=platform-elasticsearch
After=syslog.target network.target remote-fs.target nss-lookup.target

[Service]
User={{ app_user }}
Group={{ app_group }}
EnvirOnment=ES_PATH_COnF=/platform/opt/elasticsearch-{{ elasticsearch.version }}/config
EnvirOnment=JAVA_HOME=/platform/opt/jdk{{ jdk.major_version }}_{{ jdk.minor_version }}
LimitAS=infinity
LimitRSS=infinity
LimitCORE=infinity
LimitNOFILE=100000
LimitMEMLOCK=100000
StandardOutput=syslog
StandardError=syslog
WorkingDirectory=/platform/var/app/elasticsearch
ExecStart=/platform/opt/elasticsearch-{{ elasticsearch.version }}/bin/elasticsearch
ExecReload=/bin/kill -s HUP $MAINPID
ExecStop=/bin/kill -s -TERM $MAINPID
TimeoutStopSec=60
# When a JVM receives a SIGTERM signal it exits with code 143
SuccessExitStatus=143 0
Type=simple
Restart=on-failure
RestartSec=10
PIDFile=/platform/var/run/elasticsearch.pid

[Install]
WantedBy=multi-user.target

这似乎不允许我配置vm.max_map_count设置.

Jul 20 14:53:46 scratchpad elasticsearch: [2018-07-20T14:53:46,359][INFO ][o.e.b.BootstrapChecks    ] [1oQJNUK] bound or publishing to a non-loopback     address, enforcing bootstrap checks
Jul 20 14:53:46 scratchpad elasticsearch: ERROR: [1] bootstrap checks failed
Jul 20 14:53:46 scratchpad elasticsearch: [1]: max virtual memory areas vm.max_map_count [65530] is too low, increase to at least [262144]
Jul 20 14:53:46 scratchpad elasticsearch: [2018-07-20T14:53:46,376][INFO ][o.e.n.Node               ] [1oQJNUK] stopping ...
Jul 20 14:53:46 scratchpad elasticsearch: [2018-07-20T14:53:46,414][INFO ][o.e.n.Node               ] [1oQJNUK] stopped
Jul 20 14:53:46 scratchpad elasticsearch: [2018-07-20T14:53:46,414][INFO ][o.e.n.Node               ] [1oQJNUK] closing ...
Jul 20 14:53:46 scratchpad elasticsearch: [2018-07-20T14:53:46,445][INFO ][o.e.n.Node               ] [1oQJNUK] closed
Jul 20 14:53:46 scratchpad systemd: platform-elasticsearch.service: main process exited, code=exited, status=78/n/a

具体问题如下:

Jul 20 14:53:46 scratchpad elasticsearch: [1]: max virtual memory areas vm.max_map_count [65530] is too low, increase to at least [262144]

我已经能够使用以下命令在命令行上启动弹性搜索:

sudo su -c 'echo 262144 > "/proc/sys/vm/max_map_count"' && \ 
export JAVA_HOME=/platform/opt/jdk1.8.0_181 && \
export ES_PATH_COnF=/platform/opt/elasticsearch-6.3.1/config && \
/platform/opt/elasticsearch-6.3.1/bin/elasticsearch 

任何人都可以告诉我为什么LimitMEMLOCK = 100000不起作用,以及如何从systemd中有效地设置max_map_count.

我还尝试设置以下内容:

cat /etc/security/limits.d/30_elastic_limits.conf

vagrant       hard    nofile     500000
vagrant       hard    memlock     262144

但这似乎被systemd完全忽略了.

帮助,现在有点绝望!

Vivek的答案是正确的,但是,设置只会在会话期间持续.如果主机重新启动,则设置将重置为原始值.

如果要永久设置,则需要编辑/etc/sysctl.conf并设置vm.max_map_count为262144.

主机重新启动后,您可以通过运行验证设置是否仍然正确 sysctl vm.max_map_count

在Centos上,您可以使用以下命令:

sysctl -w vm.max_map_count=262144

从本质上说，这并不是一个答案，而是从docker容器的角度对有操作问题的任何人的澄清/捷径。我在Docker容器中运行的应用程序遇到了这个问题。而且正如nishant在这里解释的那样

您不需要在容器级别增加用于Elasticsearch的虚拟内存，可以通过运行以下命令为主机添加虚拟内存：

sudo sysctl -w vm.max_map_count=262144

然后重新启动您的docker-containers。

As explained by val above setting this max_map_count this way won't persist upon the restart of the machine on which is running the docker container. and so you will need to save it in a more persistent manner as explained by him above.