VNX5700_DR Slot 2: The DNS client is unable to connect to name server

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SeverityErrorSystem :VNX5700_DRDomain :LocalCreated Nov 29, 2015 4:16:52 AMMessage :Slot 2: The DNS client is unable to connect to name server 10.19.6.3 : Connection timed outFull Description :The DNS client is unable to contact a DNS server. This may happen when the Data Mover cannot reach the peer DNS server because of network problems.Recommended Action :Check the Data Mover network interface and the router configuration. Go to Unisphere > Settings > Network > Run Ping Test or us the server_ping command from the CLI to troubleshoot the network. Check the availability of the DNS server configured in the DNS client of the Data Mover (see server_dns and server_checkup commands). Test the connectivity to both the hostname and the IP address of the DNS server.Event Code :0x1310760001

日志分析结果：

问题简述

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DNS Alerts.

问题成因

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通过分析，发现如下：

Time on CS: Tue Nov 24 05:12:59 CST 2015

Output from: /nas/bin/server_dns server_2

server_2 :

DNS is stopped.

SZGAS.COM

proto:udp server(s):10.19.6.3,10.19.6.49

------------------------------------------------------------------

Nov 24 04:45:40 2015:DART:TIMESYNC:ALERT:4:Slot2:::1448312967:[server_2]:

The NTP servers are not accessible or responding tothe time service from [Wed May 13 17:09:08 2015].

-------------------------------------------------------------------

Output from: /nas/bin/server_route server_2 -list server_2 :

net 128.221.253.0 128.221.253.2 255.255.255.0 el31

net 128.221.252.0 128.221.252.2 255.255.255.0 el30

net 10.19.254.0 10.9.254.113 255.255.255.0 IF_REPLICATOR

net 10.19.4.0 10.9.4.211 255.255.255.0 IF_PMMAADMIN_50G

host 127.0.0.1 127.0.0.1 255.255.255.255 loop

-------------------------------------------------------------------

Unused Interface(s):

if=IF_REPLICATOR l=10.19.254.113 b=10.19.254.255 mac=0:60:16:5b:87:16

if=IF_PMMAADMIN_50G l=10.19.4.211 b=10.19.4.255 mac=0:60:16:5b:87:16

解决方案

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从上述日志报告可以看出您设备的10.19.6.x网段的默认路由没有配置，DNS服务没有起来所以连不上。

4网段是用来对外提供服务的生产网，254网段是replication的网段，所以内部的DNS的6网段没有配置

导致系统会报出DNSalerts。

由于您对外的数据请求和访问都是通过4网段，所以不影响您的业务访问。

下面是配置DNS默认路由的步骤：

1.先配置默认网关，请联系客户获取默认网关的地址，例如x.x.x.x；

2.然后添加默认网关，执行： server_route server_2 –add default x.x.x.x

3.检查DNS的状态，执行： server_dns server_2 SZGAS.COM 10.19.6.3 连接到DNS查找服务器

[nasadmin@BakCS0 ~]$ server_dns server_2 SZGAS.COM 10.19.6.3
server_2 : done
[nasadmin@BakCS0 ~]$

4.之后执行： server_dns server_2 查看该DNS状态是否为running

[nasadmin@BakCS0 ~]$ server_dns server_2
server_2 :
DNS is running.
SZGAS.COM
proto:udp server(s):10.9.6.3
[nasadmin@BakCS0 ~]$

5.若为stopped，则执行 server_dns server_2 –option start 将DNS服务启动起来

如上述步骤操作完毕，问题就可以解决。

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