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问题
docker安装并启动elasticsearch时内存不足
系统centos8（阿里云ecs服务器）
[root@iz2zeczvvb79boy368xppwz ~]# cat /etc/redhat-release centos linux release 8.1.1911 (core)
安装过程
docker pull elasticsearch:6.4.0
修改虚拟机内存（貌似没有效果）
sysctl -w vm.max_map_count=262144
使用docker run命令跑容器
docker run -p 9200:9200 -p 9300:9300 --name elasticsearch \ -e "discovery.type=single-node" \ -e "cluster.name=elasticsearch" \ -v /mydata/elasticsearch/plugins:/usr/share/elasticsearch/plugins \ -v /mydata/elasticsearch/data:/usr/share/elasticsearch/data \ -d elasticsearch:6.4.0
docker ps查看容器并没有启动
[root@iz2zeczvvb79boy368xppwz ~]# docker ps container id image command created status ports names edfc400862eb rabbitmq:3.7.15 "docker-entrypoint.s…" 14 hours ago up 14 hours 0.0.0.0:4369->4369/tcp, 0.0.0.0:5671-5672->5671-5672/tcp, 0.0.0.0:15671-15672->15671-15672/tcp, 0.0.0.0:25672->25672/tcp rabbitmq 2ae2f3f8dc1f nginx:1.10 "nginx -g 'daemon of…" 2 weeks ago up 2 weeks 0.0.0.0:80->80/tcp, 443/tcp nginx 164e4e7561df redis:3.2 "docker-entrypoint.s…" 2 weeks ago up 2 weeks 0.0.0.0:6379->6379/tcp redis eeabe57f1f21 mysql:5.7 "docker-entrypoint.s…" 2 weeks ago up 2 weeks 0.0.0.0:3306->3306/tcp, 33060/tcp mysql
docker ps -a 查看容器确实创建了
[root@iz2zeczvvb79boy368xppwz ~]# docker ps -a container id image command created status ports names 767829ae1d7c elasticsearch:6.4.0 "/usr/local/bin/dock…" about a minute ago exited (1) about a minute ago elasticsearch edfc400862eb rabbitmq:3.7.15 "docker-entrypoint.s…" 14 hours ago up 14 hours 0.0.0.0:4369->4369/tcp, 0.0.0.0:5671-5672->5671-5672/tcp, 0.0.0.0:15671-15672->15671-15672/tcp, 0.0.0.0:25672->25672/tcp rabbitmq 2ae2f3f8dc1f nginx:1.10 "nginx -g 'daemon of…" 2 weeks ago up 2 weeks 0.0.0.0:80->80/tcp, 443/tcp nginx 164e4e7561df redis:3.2 "docker-entrypoint.s…" 2 weeks ago up 2 weeks 0.0.0.0:6379->6379/tcp redis eeabe57f1f21 mysql:5.7 "docker-entrypoint.s…" 2 weeks ago up 2 weeks 0.0.0.0:3306->3306/tcp, 33060/tcp mysql
查看日志docker logs -f elasticsearch命令查看日志发现jvm内存不足
[root@iz2zeczvvb79boy368xppwz ~]# docker logs -f elasticsearch openjdk 64-bit server vm warning: option useconcmarksweepgc was deprecated in version 9.0 and will likely be removed in a future release. openjdk 64-bit server vm warning: info: os::commit_memory(0x00007ebf15330000, 549668585472, 0) failed; error='not enough space' (errno=12) # # there is insufficient memory for the java runtime environment to continue. # native memory allocation (mmap) failed to map 549668585472 bytes for committing reserved memory. # an error report file with more information is saved as: # logs/hs_err_pid1.log
解决方法
修改jvm.options文件配置
首先查找jvm.options文件位置（每个服务器的位置可能不同）
[root@iz2zeczvvb79boy368xppwz ~]# find / -name jvm.options /var/lib/docker/overlay2/d399872a3517b4d4acb0d2f70d0625c0f38251ffe5819a1cea00f8213de3e7f5/diff/usr/share/elasticsearch/config/jvm.options
vim进入文件修改虚拟机最小内存
[root@iz2zeczvvb79boy368xppwz ~]# vim /var/lib/docker/overlay2/d399872a3517b4d4acb0d2f70d0625c0f38251ffe5819a1cea00f8213de3e7f5/diff/usr/share/elasticsearch/config/jvm.options
找到-xms属性，修改成512m（我的elasticsearch:6.4.0默认为1g）
## jvm configuration ################################################################ ## important: jvm heap size ################################################################ ## ## you should always set the min and max jvm heap ## size to the same value. for example, to set ## the heap to 4 gb, set: ## ## -xms4g ## -xmx4g ## ## see https://www.elastic.co/guide/en/elasticsearch/reference/current/heap-size.html ## for more information ## ################################################################ # xms represents the initial size of total heap space # xmx represents the maximum size of total heap space -xms512m -xmx512m
保存并退出
vim中按i进入编辑模式，按esc退出编辑模式，按：进入命令模式，然后在底部命令行输入w为保存，q为退出，q!为强制退出。
再次启动容器，docker ps查看容器启动成功
[root@iz2zeczvvb79boy368xppwz ~]# docker ps container id image command created status ports names f5c4ed61196b elasticsearch:6.4.0 "/usr/local/bin/dock…" 15 minutes ago up 15 minutes 0.0.0.0:9200->9200/tcp, 0.0.0.0:9300->9300/tcp elasticsearch edfc400862eb rabbitmq:3.7.15 "docker-entrypoint.s…" 15 hours ago up 15 hours 0.0.0.0:4369->4369/tcp, 0.0.0.0:5671-5672->5671-5672/tcp, 0.0.0.0:15671-15672->15671-15672/tcp, 0.0.0.0:25672->25672/tcp rabbitmq 2ae2f3f8dc1f nginx:1.10 "nginx -g 'daemon of…" 2 weeks ago up 2 weeks 0.0.0.0:80->80/tcp, 443/tcp nginx 164e4e7561df redis:3.2 "docker-entrypoint.s…" 2 weeks ago up 2 weeks 0.0.0.0:6379->6379/tcp redis eeabe57f1f21 mysql:5.7 "docker-entrypoint.s…" 2 weeks ago up 2 weeks 0.0.0.0:3306->3306/tcp, 33060/tcp mysql
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