docker启动elasticsearch时内存不⾜问题及解决⽅法
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 "pe=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, 0.0.0.0:256
72->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
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 /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。
docker进入容器再次启动容器，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
总结
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