Kubernetes部署ELK问题sysctl: setting key “vm.max_map_count“, ignoring: Read-only file system

1、ES启动报错

bootstrap check failure [1] of [2]: max virtual memory areas vm.max_map_count [65530] is too low, increase to at least [262144]
bootstrap check failure [2] of [2]: the default discovery settings are unsuitable for production use; at least one of [discovery.seed_hosts, discovery.seed_providers, cluster.initial_master_nodes] must be configured

查看配置：

root@es-kibana-0:/usr/share/elasticsearch/bin# sysctl -a|grep vm.max_map_count

 修改配置：

root@es-kibana-0:/usr/share/elasticsearch# sysctl -w vm.max_map_count=262144
sysctl: setting key "vm.max_map_count", ignoring: Read-only file system

 检查发现，root是有读写权限的，为什么改不了呢？

解决方法：

原来这里的POD容器复制的是所在节点的配置，是只读的。需要在 node 节点主机上修改即可：

[root@k8s-node01 ~]# sysctl -w vm.max_map_count=262144
vm.max_map_count = 262144

再到POD里查看，发现已经同步修改：