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 CentOSLinuxrelease8.1.1911(Core)
安装过程
dockerpullelasticsearch:6.4.0
修改虚拟机内存（貌似没有效果）
sysctl-wvm.max_map_count=262144
使用dockerrun命令跑容器
dockerrun-p9200:9200-p9300:9300--nameelasticsearch\ -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\ -delasticsearch:6.4.0
dockerps查看容器并没有启动
[root@iZ2zeczvvb79boy368xppwZ~]#dockerps CONTAINERIDIMAGECOMMANDCREATEDSTATUSPORTSNAMES edfc400862ebrabbitmq:3.7.15"docker-entrypoint.s…"14hoursagoUp14hours0.0.0.0:4369->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/tcprabbitmq 2ae2f3f8dc1fnginx:1.10"nginx-g'daemonof…"2weeksagoUp2weeks0.0.0.0:80->80/tcp,443/tcpnginx 164e4e7561dfredis:3.2"docker-entrypoint.s…"2weeksagoUp2weeks0.0.0.0:6379->6379/tcpredis eeabe57f1f21mysql:5.7"docker-entrypoint.s…"2weeksagoUp2weeks0.0.0.0:3306->3306/tcp,33060/tcpmysql
dockerps-a查看容器确实创建了
[root@iZ2zeczvvb79boy368xppwZ~]#dockerps-a CONTAINERIDIMAGECOMMANDCREATEDSTATUSPORTSNAMES 767829ae1d7celasticsearch:6.4.0"/usr/local/bin/dock…"AboutaminuteagoExited(1)Aboutaminuteagoelasticsearch edfc400862ebrabbitmq:3.7.15"docker-entrypoint.s…"14hoursagoUp14hours0.0.0.0:4369->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/tcprabbitmq 2ae2f3f8dc1fnginx:1.10"nginx-g'daemonof…"2weeksagoUp2weeks0.0.0.0:80->80/tcp,443/tcpnginx 164e4e7561dfredis:3.2"docker-entrypoint.s…"2weeksagoUp2weeks0.0.0.0:6379->6379/tcpredis eeabe57f1f21mysql:5.7"docker-entrypoint.s…"2weeksagoUp2weeks0.0.0.0:3306->3306/tcp,33060/tcpmysql
查看日志dockerlogs-felasticsearch命令查看日志发现jvm内存不足
[root@iZ2zeczvvb79boy368xppwZ~]#dockerlogs-felasticsearch OpenJDK64-BitServerVMwarning:OptionUseConcMarkSweepGCwasdeprecatedinversion9.0andwilllikelyberemovedinafuturerelease. OpenJDK64-BitServerVMwarning:INFO:os::commit_memory(0x00007ebf15330000,549668585472,0)failed;error='Notenoughspace'(errno=12) # #ThereisinsufficientmemoryfortheJavaRuntimeEnvironmenttocontinue. #Nativememoryallocation(mmap)failedtomap549668585472bytesforcommittingreservedmemory. #Anerrorreportfilewithmoreinformationissavedas: #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/-namejvm.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）
##JVMconfiguration ################################################################ ##IMPORTANT:JVMheapsize ################################################################ ## ##YoushouldalwayssettheminandmaxJVMheap ##sizetothesamevalue.Forexample,toset ##theheapto4GB,set: ## ##-Xms4g ##-Xmx4g ## ##Seehttps://www.elastic.co/guide/en/elasticsearch/reference/current/heap-size.html ##formoreinformation ## ################################################################ #Xmsrepresentstheinitialsizeoftotalheapspace #Xmxrepresentsthemaximumsizeoftotalheapspace -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，dockerps查看容器启动成功
[root@iZ2zeczvvb79boy368xppwZ~]#dockerps CONTAINERIDIMAGECOMMANDCREATEDSTATUSPORTSNAMES f5c4ed61196belasticsearch:6.4.0"/usr/local/bin/dock…"15minutesagoUp15minutes0.0.0.0:9200->9200/tcp,0.0.0.0:9300->9300/tcpelasticsearch edfc400862ebrabbitmq:3.7.15"docker-entrypoint.s…"15hoursagoUp15hours0.0.0.0:4369->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/tcprabbitmq 2ae2f3f8dc1fnginx:1.10"nginx-g'daemonof…"2weeksagoUp2weeks0.0.0.0:80->80/tcp,443/tcpnginx 164e4e7561dfredis:3.2"docker-entrypoint.s…"2weeksagoUp2weeks0.0.0.0:6379->6379/tcpredis eeabe57f1f21mysql:5.7"docker-entrypoint.s…"2weeksagoUp2weeks0.0.0.0:3306->3306/tcp,33060/tcpmysql
总结
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