使用cassandra和docker-py

Question

所以基本上我试图运行一个cassandra docker实例（2.1）并按照https://hub.docker.com/_/cassandra/的指示运行cqlsh命令。

$ docker run --name some-cassandra -d cassandra:2.1
$ docker run -it --link some-cassandra:cassandra --rm cassandra sh -c 'exec cqlsh "$CASSANDRA_PORT_9042_TCP_ADDR"'

或

$ docker run -it --link some-cassandra:cassandra --rm cassandra cqlsh cassandra

手动一切正常，但是当尝试使用docker-py自动化这个流时，我遇到运行cqlsh shell的问题。 我无法执行cqlsh shell并对我从链接容器运行的cassandra docker容器运行命令。下面，我提供了代码和响应，我得到了各种命令组合，我试图让cqlsh shell工作。任何提示/建议/答案都非常感谢。

这是我正在使用的代码。

import docker

host_config = client.create_host_config(port_bindings={
        9042: 9042,
        7199: 7199,
        7001: 7001
    }
)

ctr = client.create_container('cassandra:2.1', name='some-cassandra',
                                  ports=[9042, 7199, 7001],
                                  host_config=host_config
                                  )
# start cassandra container
ctr_id = ctr['Id']

link_path = 'some-cassandra'
link_alias1 = 'cassandra'

link_ctr = client.create_container(
    'cassandra:2.1',
    command=['/bin/sh'],
    host_config=client.create_host_config(
        links={link_path: link_alias1},            
    ),
    stdin_open=True,
    detach=True,
    tty=True
)
r=client.start(ctr)

# start another linked container

r=client.start(link_ctr["Id"])

# Try to invoke cqlsh shell to run some commands

for x in [["cat /etc/hosts"], ['cqlsh',"cassandra"], ['cqlsh', '$CASSANDRA_PORT_9042_TCP_ADDR'], ['cqlsh','172.17.0.4', '9042'], ['cqlsh','172.17.0.4', '9160'], ['cqlsh','172.17.0.4', '7199']]:
    res = client.exec_create(link_ctr["Id"], cmd=x)
    exec_log = client.exec_start(res)
    print exec_log

client.stop(link_ctr["Id"])
client.stop(ctr)
client.remove_container(ctr)
client.remove_container(link_ctr)

这是我得到的输出

cat / etc / hosts /

172.17.0.5  5da36a67e228
127.0.0.1   localhost
::1 localhost ip6-localhost ip6-loopback
fe00::0 ip6-localnet
ff00::0 ip6-mcastprefix
ff02::1 ip6-allnodes
ff02::2 ip6-allrouters
172.17.0.4  cassandra 000c295fb3c7 some-cassandra

[＆＃39; cqlsh＆＃39;＆＃34;卡桑德拉＆＃34;]

Connection error: ('Unable to connect to any servers', {'cassandra': error(111, "Tried connecting to [('172.17.0.4', 9042)]. Last error: Connection refused")})

[＆＃39; cqlsh＆＃39;，＆＃39; $ CASSANDRA_PORT_9042_TCP_ADDR＆＃39;]

Connection error: ('Unable to connect to any servers', {'$CASSANDRA_PORT_9042_TCP_ADDR': gaierror(-2, 'Name or service not known')})

[＆＃39; cqlsh＆＃39;，＆＃39; 172.17.0.4＆＃39;，＆＃39; 9042＆＃39;]

Connection error: ('Unable to connect to any servers', {'172.17.0.4': error(111, "Tried connecting to [('172.17.0.4', 9042)]. Last error: Connection refused")})

[＆＃39; cqlsh＆＃39;，＆＃39; 172.17.0.4＆＃39;，＆＃39; 9160＆＃39;]

Connection error: ('Unable to connect to any servers', {'172.17.0.4': error(111, "Tried connecting to [('172.17.0.4', 9160)]. Last error: Connection refused")})

[＆＃39; cqlsh＆＃39;，＆＃39; 172.17.0.4＆＃39;，＆＃39; 7199＆＃39;]

Connection error: ('Unable to connect to any servers', {'172.17.0.4': error(111, "Tried connecting to [('172.17.0.4', 7199)]. Last error: Connection refused")})

Answer 1

我通过使用cassandra drover for python解决了这个问题。

原始google群组帖子https://groups.google.com/forum/#!topic/docker-dev/LUEuHWy4GVU

Cassandra驱动程序用于python https://datastax.github.io/python-driver/