[docker] docker: Error response from daemon: Conflict. The name "" is already in use by container

docker run --name test -e MYSQL_ROOT_PASSWORD=hello -d mysql:5.6

docker: Error response from daemon: Conflict. The name "/test" is already in use by container

使用 docker run 出現 這樣的訊息，因為上次的異常結束 docker ps 可能看到空的

$ docker ps
CONTAINER ID        IMAGE               COMMAND             CREATED             STATUS              PORTS               NAMES


使用 docker ps -a

$ docker ps -a
CONTAINER ID        IMAGE               COMMAND                  CREATED             STATUS                     PORTS               NAMES
e60e7335dbb6        mysql               "docker-entrypoint.sh"   34 hours ago        Exited (1) 2 minutes ago   3306/tcp            test
d7de7777925f        ubuntu              "/bin/bash"              35 hours ago        Exited (0) 34 hours ago                        angry_bohr


$ docker start e60e7335dbb6
e60e7335dbb6

$ docker exec -it e60e7335dbb6 /bin/bash

或是使用 docker rm 去移除 container

$docker rm e60e7335dbb6

or

$docker rm -f e60e7335dbb6

[elasticsearch] high performance elasticsearch configuration 設計配置

底下列出一份經過tuning 過的 elasticsearch configuration

/etc/elasticsearch/elasticsearch.yml

• cluster.name: estic12
• which is used to discover and auto-join other nodes
• node.name: "pcnode1"
• You may also want to change the default node name for each node to something like the display hostname. By default Elasticsearch will randomly pick a Marvel character name from a list of around 3000 names when your node starts up

• node.master: true
• node.data: false
• dedicated master nodes
• path.data: /spare3
• The location of the data files of each index / shard allocated on the node. Can hold multiple locations.
• Note, there are no multiple copies of the same data, in that, its similar to RAID 0. Though simple, it should provide a good solution for people that don’t want to mess with RAID. Here is how it is configured:
• path.data: /mnt/first,/mnt/second
• Or the in an array format:
• path.data: ["/mnt/first", "/mnt/second"]
• discovery.zen.ping.multicast.enabled: false
• discovery.zen.ping.unicast.hosts: ["tic12-a42.trendmicro.com", "tic12.trendmicro.com", "tic12-a45.trendmicro.com"]
• The zen discovery is the built in discovery module for elasticsearch and the default. It provides both multicast and unicast discovery as well being easily extended to support cloud environments.

• threadpool.bulk.type: fixed
• threadpool.bulk.size: 100
• threadpool.bulk.queue_size: 320
• For bulk operations, defaults to fixed size # of available processors. queue_size 50.
• The fixed thread pool holds a fixed size of threads to handle the requests with a queue (optionally bounded) for pending requests that have no threads to service them.

• discovery.zen.minimum_master_nodes: 2 #(es_node_num)/2 +1
• sets the minimum number of master eligible nodes that need to join a newly elected master in order for an election to complete and for the elected node to accept its mastership.
• indices.memory.index_buffer_size: 30%
• The indexing buffer setting allows to control how much memory will be allocated for the indexing process.
• accepts either a percentage or a byte size value. It defaults to 10%, meaning that 10% of the total memory allocated to a node will be used as the indexing buffer size.
• index.translog.flush_threshold_ops: 50000
• Each shard has a transaction log or write ahead log associated with it. It allows to guarantee that when an index/delete operation occurs, it is applied atomically, while not "committing" the internal Lucene index for each request.
• After how many operations to flush.
• index.refresh_interval: 30s
• The async refresh interval of a shard.
• How often to perform a refresh operation, which makes recent changes to the index visible to search.

[life] 2016 04 16 更新 日統客運 西螺站 的時刻表

更新了一張 日統客運 西螺站 的時刻表