無法連接到 127.0.0.1:27017，連接被拒絕

所以我目前正在嘗試為我的 centos 機器設置 mongodb 在本地執行和託管。但是當我嘗試連接時，我得到了這個：

#mongo
MongoDB shell version v3.4.24
connecting to: mongodb://127.0.0.1:27017
2021-04-20T22:06:51.585+0000 W NETWORK  [thread1] Failed to connect to 127.0.0.1:27017, in(checking socket for error after poll), reason: Connection refused
2021-04-20T22:06:51.585+0000 E QUERY    [thread1] Error: couldn't connect to server 127.0.0.1:27017, connection attempt failed :
connect@src/mongo/shell/mongo.js:240:13
@(connect):1:6
exception: connect failed

我現在已經閱讀了很多關於它的內容。

• 使用者 mongod 是 /var/lib/monogodb 的所有者
• 文件 /var/lib/mongodb/mongod.lock 不存在
• 重新啟動伺服器導致此問題。

我認為（個人）認為這與 iptables 有關。當我啟動 mongodb 服務時，我得到了這個：

# service mongod status
Redirecting to /bin/systemctl status mongod.service
● mongod.service - MongoDB Database Server
  Loaded: loaded (/usr/lib/systemd/system/mongod.service; enabled; vendor preset: disabled)
  Active: failed (Result: exit-code) since Tue 2021-04-20 22:05:26 UTC; 27s ago
    Docs: https://docs.mongodb.org/manual
 Process: 1772 ExecStart=/usr/bin/mongod $OPTIONS (code=exited, status=51)
 Process: 1770 ExecStartPre=/usr/bin/chmod 0755 /var/run/mongodb (code=exited, status=0/SUCCESS)
 Process: 1768 ExecStartPre=/usr/bin/chown mongod:mongod /var/run/mongodb (code=exited, status=0/SUCCESS)
 Process: 1766 ExecStartPre=/usr/bin/mkdir -p /var/run/mongodb (code=exited, status=0/SUCCESS)

Apr 20 22:05:25 Server-Elf systemd[1]: Starting MongoDB Database Server...
Apr 20 22:05:25 Server-Elf mongod[1772]: about to fork child process, waiting until server is ready for connections.
Apr 20 22:05:25 Server-Elf mongod[1772]: forked process: 1774
Apr 20 22:05:26 Server-Elf mongod[1772]: ERROR: child process failed, exited with error number 51
Apr 20 22:05:26 Server-Elf systemd[1]: mongod.service: Control process exited, code=exited status=51
Apr 20 22:05:26 Server-Elf systemd[1]: mongod.service: Failed with result 'exit-code'.
Apr 20 22:05:26 Server-Elf systemd[1]: Failed to start MongoDB Database Server.

iptables 設置：

# iptables -L
Chain INPUT (policy ACCEPT)
target     prot opt source               destination
ACCEPT     all  --  anywhere             anywhere             state RELATED,ESTABLISHED
ACCEPT     icmp --  anywhere             anywhere
ACCEPT     all  --  anywhere             anywhere
ACCEPT     tcp  --  anywhere             anywhere             state NEW tcp dpt:ssh
REJECT     all  --  anywhere             anywhere             reject-with icmp-host-prohibited

Chain FORWARD (policy ACCEPT)
target     prot opt source               destination
REJECT     all  --  anywhere             anywhere             reject-with icmp-host-prohibited

Chain OUTPUT (policy ACCEPT)
target     prot opt source               destination

/etc/mongod.conf 顯示：net: bindIp: 127.0.0.1

即使在停止 iptables 之後錯誤仍然存在。我很迷茫 非常感謝幫助。非常感謝你提前

煩人，但只能解決：恢復整個伺服器的舊備份。

雖然這顯然不理想，但我找不到重新打開對 127.0.0.1:27017 的訪問的方法

一些數據失去了，但是哦，好吧，我已經備份了大部分數據 - 現在只是重新設置它。

感謝您的幫助/建議。

引用自：https://serverfault.com/questions/1061025