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从 discovery.etcd.io 中删除过时的 CoreOS 节点

tag-icon • tag-icon coreos etcd
从 discovery.etcd.io 中删除过时的 CoreOS 节点

我从 CoreOS 集群中删除了一个节点，并在其位置上添加了一个新节点。不幸的是，它获取了与旧机器相同的 IP。

这阻止了 etcd 发现集群的其余部分，日志中出现如下消息：“失败：加入请求失败：对等地址已存在”

如何从 discovery.etcd.io 中删除旧节点？

答案1

如果你知道机器 ID，可以简短回答

发送 HTTP DELETE 请求至https://discovery.etcd.io/<cluster-id>/<machine-id>

例如

curl https://discovery.etcd.io/abcdef0123456789abcdef0123456789/7cf9a5cf5e3b4baea82e28618bffeaf5 -XDELETE

更长的答案-如何找到要删除的机器 ID

首先，从发现 URL 获取 JSON 对象，例如

https://discovery.etcd.io/abcdef0123456789abcdef0123456789

它看起来有点像这样：

{
  "action": "get",
  "node": {
    "key": "\/_etcd\/registry\/abcdef0123456789abcdef0123456789",
    "dir": true,
    "nodes": [
      {
        "key": "\/_etcd\/registry\/abcdef0123456789abcdef0123456789\/6148dbb812a44dbe8773bebf329634e7",
        "value": "http:\/\/10.132.47.218:7001",
        "expiration": "2015-04-15T17:58:12.753046544Z",
        "ttl": 598570,
        "modifiedIndex": 453369429,
        "createdIndex": 453369429
      },
      {
        "key": "\/_etcd\/registry\/abcdef0123456789abcdef0123456789\/646fbdaee73544e6ac289894e935f0c7",
        "value": "http:\/\/10.132.47.218:7001",
        "expiration": "2015-04-15T18:30:03.08506867Z",
        "ttl": 600480,
        "modifiedIndex": 453418705,
        "createdIndex": 453418705
      },
      {
        "key": "\/_etcd\/registry\/abcdef0123456789abcdef0123456789\/05e0decf1d9240819382db7a7f8ff2e7",
        "value": "http:\/\/10.132.58.166:7001",
        "expiration": "2015-04-14T23:47:31.402148037Z",
        "ttl": 533129,
        "modifiedIndex": 451690943,
        "createdIndex": 451690943
      },
      {
        "key": "\/_etcd\/registry\/abcdef0123456789abcdef0123456789\/af2783b2327e4f3a9b6e7ea169814a06",
        "value": "http:\/\/10.132.58.167:7001",
        "expiration": "2015-04-14T23:47:38.676204353Z",
        "ttl": 533136,
        "modifiedIndex": 451691169,
        "createdIndex": 451691169
      }
    ],
    "modifiedIndex": 426955695,
    "createdIndex": 426955695
  }
}

假设我们重用的 IP 是10.132.47.218- 我们想要识别与之对应的机器 ID。我们可以从密钥中看到这是6148dbb812a44dbe8773bebf329634e7

现在我们可以简单地使用 DELETE 动词来删除它

curl https://discovery.etcd.io/abcdef0123456789abcdef0123456789/7cf9a5cf5e3b4baea82e28618bffeaf5 -XDELETE

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