Docker - 麋鹿 - vm.max_map_count

Question

我正在尝试使用 docker 的图像 elk-docker (https://elk-docker.readthedocs.io/) ，使用 Docker 撰写。 .yml 文件，是这样的：

elk:
image: sebp/elk
ports:
  - "5601:5601"
  - "9200:9200"
  - "5044:5044"

当我运行命令：sudo docker-compose up时，控制台显示：

* Starting Elasticsearch Server
sysctl: setting key "vm.max_map_count": Read-only file system
...fail!
waiting for Elasticsearch to be up (1/30)
waiting for Elasticsearch to be up (2/30)
waiting for Elasticsearch to be up (3/30)
waiting for Elasticsearch to be up (4/30)
waiting for Elasticsearch to be up (5/30)
waiting for Elasticsearch to be up (6/30)
waiting for Elasticsearch to be up (7/30)
waiting for Elasticsearch to be up (8/30)
waiting for Elasticsearch to be up (9/30)
waiting for Elasticsearch to be up (10/30)
waiting for Elasticsearch to be up (11/30)
waiting for Elasticsearch to be up (12/30)
waiting for Elasticsearch to be up (13/30)
waiting for Elasticsearch to be up (14/30)
waiting for Elasticsearch to be up (15/30)
waiting for Elasticsearch to be up (16/30)
waiting for Elasticsearch to be up (17/30)
waiting for Elasticsearch to be up (18/30)
waiting for Elasticsearch to be up (19/30)
waiting for Elasticsearch to be up (20/30)
waiting for Elasticsearch to be up (21/30)
waiting for Elasticsearch to be up (22/30)
waiting for Elasticsearch to be up (23/30)
waiting for Elasticsearch to be up (24/30)
waiting for Elasticsearch to be up (25/30)
waiting for Elasticsearch to be up (26/30)
waiting for Elasticsearch to be up (27/30)
waiting for Elasticsearch to be up (28/30)
waiting for Elasticsearch to be up (29/30)
waiting for Elasticsearch to be up (30/30)
Couln't start Elasticsearch. Exiting.
Elasticsearch log follows below.
cat: /var/log/elasticsearch/elasticsearch.log: No such file or directory
docker_elk_1 exited with code 1

我该如何解决这个问题？

Answer 1

您可能需要在主机本身的 /etc/sysctl.conf 中设置 vm.max_map_count，这样 Elasticsearch 就不会尝试从容器内部执行此操作。如果您不知道所需的值，请尝试将当前设置加倍并继续，直到 Elasticsearch 成功启动。 Documentation recommends至少262144。

Answer 2

在 Docker 主机终端（Docker CLI）运行 命令中：

docker-machine ssh
sudo sysctl -w vm.max_map_count=262144
exit

Answer 3

1. 进入你的 docker 容器

   # docker exec -it <container_id> /bin/bash
   

2. 您可以查看您当前的max_map_count值

   # more /proc/sys/vm/max_map_count
   

3. 临时设置max_map_count值（容器（主机）重启不会持久化max_map_count 值）

   # sysctl -w vm.max_map_count=262144
   

4. 永久设置值

   1. # vi /etc/sysctl.conf
        vm.max_map_count=262144
   
   2. # vi /etc/rc.local 
        #put parameter inside rc.local file
        echo 262144 > /proc/sys/vm/max_map_count
   

Answer 4

您可以通过两种方式做到这一点。

1. 临时设置max_map_count：
   • sudo sysctl -w vm.max_map_count=262144
     但这只会持续到您重新启动系统。
2. 永久
   • 在您的主机中
     • vi /etc/sysctl.conf
     • 输入 vm.max_map_count=262144
     • 重启

Answer 5

您必须至少在 /etc/sysctl.conf 中设置 vm.max_map_count 变量 262144

之后您可以使用 sysctl --system

重新加载设置