当salt-master节点的IP出现问题，如不通或有冲突时，会导致salt-stack系统异常。IP不通时，salt-minion节点会出现SaltReqTimeoutError警告；IP冲突则引起认证失败。解决办法包括检查网络连接、更新ARP表和解决IP冲突。
1. salt-master的IP不通
比如salt-master节点网线掉了，或者当前masterIP漂移过，网卡的mac地址变了，但是salt-minion节点自身的arp表没有更新。
salt- minion日志特征：
2016-04-12 20:37:48,740 [salt.crypt ][WARNING ] SaltReqTimeoutError: Waited 60 seconds
2016-04-12 20:38:58,814 [salt.crypt ][WARNING ] SaltReqTimeoutError: Waited 60 seconds
2016-04-12 20:40:08,888 [salt.crypt ][WARNING ] SaltReqTimeoutError: Waited 60 seconds
2016-04-12 20:41:18,963 [salt.crypt ][WARNING ] SaltReqTimeoutError: Waited 60 seconds
2016-04-12 20:42:29,036 [salt.crypt ][WARNING ] SaltReqTimeoutError: Waited 60 seconds
若是master节点网线断了，那么所有minion节点都会有这个日志；
若只是部分minion的arp表没有更新，则只是没有更新arp表的minion上才有此日志
arp没有更新图示：
2.salt-master的IP有冲突
master日志特征：（没有命了执行权限）
2016-04-13 10:35:03,050 [salt.master ][WARNING ] Authentication failure of type "user" occurred.
2016-04-13 10:35:03,534 [salt.master ][WARNING ] Authentication failure of type "user" occurred.
2016-04-13 10:35:04,021 [salt.master ][WARNING ] Authentication failure of type "user" occurred.
2016-04-13 10:35:04,500 [salt.master ][WARNING ] Authentication failure of type "user" occurred.
2016-04-13 10:35:04,912 [salt.master ][WARNING ] Authentication failure of type "user" occurred.
salt-minion日志特征：（网络不通）
2016-04-12 20:37:48,740 [salt.crypt ][WARNING ] SaltReqTimeoutError: Waited 60 seconds
2016-04-12 20:38:58,814 [salt.crypt ][WARNING ] SaltReqTimeoutError: Waited 60 seconds
2016-04-12 20:40:08,888 [salt.crypt ][WARNING ] SaltReqTimeoutError: Waited 60 seconds
2016-04-12 20:41:18,963 [salt.crypt ][WARNING ] SaltReqTimeoutError: Waited 60 seconds
2016-04-12 20:42:29,036 [salt.crypt ][WARNING ] SaltReqTimeoutError: Waited 60 seconds
salt-master接的的/var/log/messages日志里可以查到类似记录：
Apr 12 20:35:26 localhost /etc/sysconfig/network-scripts/ifup-eth: Error, some other host already uses address 126.251.1.150.
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