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远程连接mongodb时，27017端口连接不上的解决办法

时间：2015-08-16 17:58:44   收藏：0   阅读：16194

一、背景描述：

     我在linux  RED7上安装了mongodb，并没有修改mongodb的配置文件。然后通过另外一台电脑用pymongo连接mongodb时，报错：timeout。

     ping IP 是成功的。 telnet IP 27017 的时候，提示：27017端口连接不上。

二、解决过程：

      各种百度，远程连接mongodb失败，网上资料显示原因有两个：

      1、mongodb的配置文件中的bind_ip 默认为127.0.0.1，默认只有本机可以连接。  此时，需要将bind_ip配置为0.0.0.0，表示接受任何IP的连接。

      2、防火墙阻止了27017端口。

      于是，先修改mongodb配置文件，并重启mongod服务。

      各种百度关闭防火墙。

      -----------但是试了很久很久，仍然telnet时提示：27017端口连接不上。

      使用google，发现如下文章：http://shaurong.blogspot.com/2014/07/centos-70-x64.html

      解决了我的问题。重点是由于在RED7中，关闭防火墙的命令改为：systemctl stop firewalld

      这样后，便可以真正关闭防火墙功能。远程连接mongodb成功！

      上述连接：http://shaurong.blogspot.com/2014/07/centos-70-x64.html 内容如下（需翻 墙才可访问，所以就把原文复制过来了。望原作者莫见怪！）：

技术分享 
 [研究] CentOS 7.0 x64 的 iptables 與 firewall-cmd 防火牆
[研究] CentOS 7.0 x64 的 iptables 與 firewall-cmd 防火牆

2014-07-25
2014-08-01 修訂

CentOS 7.0 開始，服務的管理使用變成用 systemctl，例如 httpd 的使用可用下面幾種方式

# systemctl status|start|stop|restart|reload httpd
OR 
# service httpd status|start|stop|restart|reload
OR 
# apachectl configtest| graceful

service httpd 會自動重導指令到 systemctl 命令，問題不大。

但是防火牆就有問題了，因為架網站時本機測試正常，遠端關了防火牆卻仍連不上，所以做了點研究測試。

[root@localhost ~]# yum -y install httpd
[root@localhost ~]# service httpd restart
Redirecting to /bin/systemctl restart  httpd.service
[root@localhost ~]# service httpd status
Redirecting to /bin/systemctl status  httpd.service
httpd.service - The Apache HTTP Server
   Loaded: loaded (/usr/lib/systemd/system/httpd.service; disabled)
   Active: active (running) since Fri 2014-07-25 15:54:58 CST; 21s ago
 Main PID: 14250 (httpd)
   Status: "Total requests: 0; Current requests/sec: 0; Current traffic:   0 B/sec"
   CGroup: /system.slice/httpd.service
           ?   ? 14250 /usr/sbin/httpd -DFOREGROUND
           ?   ? 14251 /usr/sbin/httpd -DFOREGROUND
           ?   ? 14252 /usr/sbin/httpd -DFOREGROUND
           ?   ? 14253 /usr/sbin/httpd -DFOREGROUND
           ?   ? 14254 /usr/sbin/httpd -DFOREGROUND
           ?   ? 14255 /usr/sbin/httpd -DFOREGROUND

Jul 25 15:54:58 localhost.localdomain systemd[1]: Starting The Apache HTTP Se...
Jul 25 15:54:58 localhost.localdomain httpd[14250]: AH00558: httpd: Could not...
Jul 25 15:54:58 localhost.localdomain systemd[1]: Started The Apache HTTP Ser...
Hint: Some lines were ellipsized, use -l to show in full.
[root@localhost ~]# ps aux | grep httpd
root     14250  0.0  0.2 209484  4804 ?        Ss   15:54   0:00 /usr/sbin/http  -DFOREGROUND
apache   14251  0.0  0.1 211568  2968 ?        S    15:54   0:00 /usr/sbin/http  -DFOREGROUND
apache   14252  0.0  0.1 211568  2968 ?        S    15:54   0:00 /usr/sbin/http  -DFOREGROUND
apache   14253  0.0  0.1 211568  2968 ?        S    15:54   0:00 /usr/sbin/http  -DFOREGROUND
apache   14254  0.0  0.1 211568  2968 ?        S    15:54   0:00 /usr/sbin/http  -DFOREGROUND
apache   14255  0.0  0.1 211568  2968 ?        S    15:54   0:00 /usr/sbin/http  -DFOREGROUND
root     14276  0.0  0.0 112640   980 pts/1    R+   15:55   0:00 grep --color=auto httpd
[root@localhost ~]#

[root@localhost ~]# service iptables stop
Redirecting to /bin/systemctl stop  iptables.service

(下圖) 本機上測試正常

(下圖) 遠端去連失敗

檢查防火牆狀態，是 inactive 的

[root@localhost ~]# service iptables -L
The service command supports only basic LSB actions (start, stop, restart, try-restart, reload, force-reload, status). For other actions, please try to use systemctl.

[root@localhost ~]# service iptables status
Redirecting to /bin/systemctl status  iptables.service
iptables.service - IPv4 firewall with iptables
   Loaded: loaded (/usr/lib/systemd/system/iptables.service; disabled)
   Active: inactive (dead)

Jul 25 15:56:53 localhost.localdomain systemd[1]: Stopped IPv4 firewall with ...
Hint: Some lines were ellipsized, use -l to show in full.

列出防火牆  rules，居然仍有

[root@localhost ~]# iptables -L
Chain INPUT (policy ACCEPT)
target     prot opt source               destination
ACCEPT     all  --  anywhere             anywhere             ctstate RELATED,ESTABLISHED
ACCEPT     all  --  anywhere             anywhere
INPUT_direct  all  --  anywhere             anywhere
INPUT_ZONES_SOURCE  all  --  anywhere             anywhere
INPUT_ZONES  all  --  anywhere             anywhere
ACCEPT     icmp --  anywhere             anywhere
REJECT     all  --  anywhere             anywhere             reject-with icmp-host-prohibited

Chain FORWARD (policy ACCEPT)
target     prot opt source               destination
ACCEPT     all  --  anywhere             anywhere             ctstate RELATED,ESTABLISHED
ACCEPT     all  --  anywhere             anywhere
FORWARD_direct  all  --  anywhere             anywhere
FORWARD_IN_ZONES_SOURCE  all  --  anywhere             anywhere
FORWARD_IN_ZONES  all  --  anywhere             anywhere
FORWARD_OUT_ZONES_SOURCE  all  --  anywhere             anywhere
FORWARD_OUT_ZONES  all  --  anywhere             anywhere
ACCEPT     icmp --  anywhere             anywhere
REJECT     all  --  anywhere             anywhere             reject-with icmp-host-prohibited

Chain OUTPUT (policy ACCEPT)
target     prot opt source               destination
OUTPUT_direct  all  --  anywhere             anywhere

Chain FORWARD_IN_ZONES (1 references)
target     prot opt source               destination
FWDI_public  all  --  anywhere             anywhere            [goto]
FWDI_public  all  --  anywhere             anywhere            [goto]

Chain FORWARD_IN_ZONES_SOURCE (1 references)
target     prot opt source               destination

Chain FORWARD_OUT_ZONES (1 references)
target     prot opt source               destination
FWDO_public  all  --  anywhere             anywhere            [goto]
FWDO_public  all  --  anywhere             anywhere            [goto]

Chain FORWARD_OUT_ZONES_SOURCE (1 references)
target     prot opt source               destination

Chain FORWARD_direct (1 references)
target     prot opt source               destination

Chain FWDI_public (2 references)
target     prot opt source               destination
FWDI_public_log  all  --  anywhere             anywhere
FWDI_public_deny  all  --  anywhere             anywhere
FWDI_public_allow  all  --  anywhere             anywhere

Chain FWDI_public_allow (1 references)
target     prot opt source               destination

Chain FWDI_public_deny (1 references)
target     prot opt source               destination

Chain FWDI_public_log (1 references)
target     prot opt source               destination

Chain FWDO_public (2 references)
target     prot opt source               destination
FWDO_public_log  all  --  anywhere             anywhere
FWDO_public_deny  all  --  anywhere             anywhere
FWDO_public_allow  all  --  anywhere             anywhere

Chain FWDO_public_allow (1 references)
target     prot opt source               destination

Chain FWDO_public_deny (1 references)
target     prot opt source               destination

Chain FWDO_public_log (1 references)
target     prot opt source               destination

Chain INPUT_ZONES (1 references)
target     prot opt source               destination
IN_public  all  --  anywhere             anywhere            [goto]
IN_public  all  --  anywhere             anywhere            [goto]

Chain INPUT_ZONES_SOURCE (1 references)
target     prot opt source               destination

Chain INPUT_direct (1 references)
target     prot opt source               destination

Chain IN_public (2 references)
target     prot opt source               destination
IN_public_log  all  --  anywhere             anywhere
IN_public_deny  all  --  anywhere             anywhere
IN_public_allow  all  --  anywhere             anywhere

Chain IN_public_allow (1 references)
target     prot opt source               destination
ACCEPT     tcp  --  anywhere             anywhere             tcp dpt:ssh ctstate NEW

Chain IN_public_deny (1 references)
target     prot opt source               destination

Chain IN_public_log (1 references)
target     prot opt source               destination

Chain OUTPUT_direct (1 references)
target     prot opt source               destination
[root@localhost ~]#

經過研究發現，應該要改用 firewall-cmd 命令

要暫時開放 http port，可執行
# firewall-cmd --add-service=http

要永久開放 http port，可執行
# firewall-cmd --permanent --add-service=http
# systemctl restart firewalld

要停掉
[root@localhost ~]# systemctl stop firewalld

下面確認一下，真的停掉了

[root@localhost ~]# iptables -L
Chain INPUT (policy ACCEPT)
target     prot opt source               destination

Chain FORWARD (policy ACCEPT)
target     prot opt source               destination

Chain OUTPUT (policy ACCEPT)
target     prot opt source               destination
[root@localhost ~]#

(下圖) 再從遠端連上網站看看，成功了

也就是 service iptables stop 無法停掉防火牆了 ( 看下面訊息該有支援，Bug 嗎 ?)

[root@localhost ~]# service iptables
The service command supports only basic LSB actions (start, stop, restart, try-restart, reload, force-reload, status). For other actions, please try to use systemctl.

設定 httpd 隨作業系統啟動
systemctl enable  httpd

其他常用 firewall-cmd 命令

# firewall-cmd --state
# firewall-cmd --list-all
# firewall-cmd --list-interfaces
# firewall-cmd --get-service
# firewall-cmd --query-service service_name
# firewall-cmd --add-port=8080/tcp

(完)

相關

[研究] CentOS 7.0 x64 的網站架設與防火牆
http://shaurong.blogspot.tw/2014/07/centos-linux-701406.html

Installing LAMP (Linux, Apache, MariaDB, PHP/PhpMyAdmin) in RHEL/CentOS 7.0
http://www.tecmint.com/install-lamp-in-centos-7/
点击查看文章内容

     

三、RED7中通过yum安装mongodb的官方步骤：

     http://docs.mongodb.org/master/tutorial/install-mongodb-on-red-hat/?_ga=1.11182708.1945386581.1439519252

四、关于RED 7中关闭防火墙命令的描述如下：

     http://linux.it.net.cn/CentOS/fast/2014/1102/7635.html

 

   

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