mongodb - 如何使用副本集以安静模式进行 mongo shell

Question

当我尝试使用 --eval 执行 JavaScript 代码时，mongo shell 会生成额外的输出，--quiet 选项似乎不起作用

check_mongodb_availability() {
  local hostname=$1
  local database=$2
  local js=" var found = 0;
             var dbs = db.getMongo().getDBNames();
              for(var i in dbs) {
                if (dbs[i].toString() == '"${database}"') found = 1;
              }
              if (found === 1) print(true); else print(false);
           "

  if [ $(mongo --host $hostname --eval "$js" --quiet) == "true" ]; then
    return 1
  else
    return 0
  fi
}

上述函数失败，提示“参数太多”

它的输出如下

2019-10-10T10:37:57.262+0000 I NETWORK [js] Starting new replica set monitor for replicaSet/172.31.79.62:27017,172.31.69.171:27017,172.31.73.190:27017 2019-10-10T10:37:57.263+0000 I NETWORK [js] Successfully connected to 172.31.69.171:27017 (1 connections now open to 172.31.69.171:27017 with a 5 second timeout) 2019-10-10T10:37:57.263+0000 I NETWORK [ReplicaSetMonitor-TaskExecutor] Successfully connected to 172.31.79.62:27017 (1 connections now open to 172.31.79.62:27017 with a 5 second timeout) 2019-10-10T10:37:57.264+0000 I NETWORK [js] changing hosts to replicaSet/172.31.79.62:27017,mongodb-replica-2:27017,mongodb-replica-3:27017 from replicaSet/172.31.69.171:27017,172.31.73.190:27017,172.31.79.62:27017 2019-10-10T10:37:57.265+0000 I NETWORK [ReplicaSetMonitor-TaskExecutor] Successfully connected to mongodb-replica-2:27017 (1 connections now open to mongodb-replica-2:27017 with a 5 second timeout) 2019-10-10T10:37:57.265+0000 I NETWORK [js] Successfully connected to mongodb-replica-3:27017 (1 connections now open to mongodb-replica-3:27017 with a 5 second timeout) true

我需要通过避免所有额外的噪音来打印“true”或“false”

Answer 1

不幸的是，这是一个在 2016 年首次出现的活跃 bug...

https://jira.mongodb.org/browse/SERVER-27159

两种可能的解决方法:

• 从主机列表中删除副本集名称。例如: host-1:27017,host-2:27017,host-3:27017 而不是 my-replica-set:host-1:27017,host-2:27017,host -3:27017
• 通过 tail 管道输出