[root@ip-10-45-76-194 ~]# cat /etc/redhat-release
CentOS release 6.5 (Final)

[root@ip-10-45-76-194 ~]# salt-minion --version
salt-minion 2015.8.8 (Beryllium)


[root@ip-10-45-76-194 ~]# salt-minion -ldebug
[DEBUG   ] Reading configuration from /etc/salt/minion
[DEBUG   ] Configuration file path: /etc/salt/minion
[WARNING ] Insecure logging configuration detected! Sensitive data may be logged.
[INFO    ] Setting up the Salt Minion "ch3ll-cent6"
[DEBUG   ] Created pidfile: /var/run/salt-minion.pid
[DEBUG   ] Reading configuration from /etc/salt/minion
[DEBUG   ] Please install 'virt-what' to improve results of the 'virtual' grain.
[WARNING ] IMPORTANT: Do not use md5 hashing algorithm! Please set "hash_type" to SHA256 in Salt Minion config!
[INFO    ] The Salt Minion is starting up
[INFO    ] Minion is starting as user 'root'
[DEBUG   ] AsyncEventPublisher PUB socket URI: ipc:///var/run/salt/minion/minion_event_78e23e6acb_pub.ipc
[DEBUG   ] AsyncEventPublisher PULL socket URI: ipc:///var/run/salt/minion/minion_event_78e23e6acb_pull.ipc
[INFO    ] Starting pub socket on ipc:///var/run/salt/minion/minion_event_78e23e6acb_pub.ipc
[INFO    ] Starting pull socket on ipc:///var/run/salt/minion/minion_event_78e23e6acb_pull.ipc
[DEBUG   ] Minion 'ch3ll-cent6' trying to tune in


[root@ip-10-45-76-194 ~]# grep null /etc/salt/minion
environment: null
file_ignore_glob: null
password: null
pillarenv: null
state_top_saltenv: null
username: null



==============redhat6==================
[root@ip-10-141-250-223 ~]# cat /etc/redhat-release
Red Hat Enterprise Linux Server release 6.5 (Santiago)

[root@ip-10-141-250-223 ~]# salt --version
salt 2015.8.8.2 (Beryllium)


[root@ip-10-141-250-223 ~]# cat /etc/salt/minion | grep -i regex
file_ignore_regex: []


[root@ip-10-141-250-223 ~]# grep -i null /etc/salt/minion
environment: null
file_ignore_glob: null
password: null
pillarenv: null
state_top_saltenv: null
username: null


[root@ip-10-141-250-223 ~]# salt-minion -ldebug
[DEBUG   ] Reading configuration from /etc/salt/minion
[DEBUG   ] Key 'file_ignore_glob' with value None has an invalid type of NoneType, a list is required for this value
[DEBUG   ] Configuration file path: /etc/salt/minion
[WARNING ] Insecure logging configuration detected! Sensitive data may be logged.
[INFO    ] Setting up the Salt Minion "ch3ll-ec2-rhel6"
[DEBUG   ] Created pidfile: /var/run/salt-minion.pid
[DEBUG   ] Reading configuration from /etc/salt/minion
[WARNING ] IMPORTANT: Do not use md5 hashing algorithm! Please set "hash_type" to SHA256 in Salt Minion config!
[INFO    ] The Salt Minion is starting up
[INFO    ] Minion is starting as user 'root'
[DEBUG   ] AsyncEventPublisher PUB socket URI: ipc:///var/run/salt/minion/minion_event_b3c9953a6b_pub.ipc
[DEBUG   ] AsyncEventPublisher PULL socket URI: ipc:///var/run/salt/minion/minion_event_b3c9953a6b_pull.ipc
[INFO    ] Starting pub socket on ipc:///var/run/salt/minion/minion_event_b3c9953a6b_pub.ipc
[INFO    ] Starting pull socket on ipc:///var/run/salt/minion/minion_event_b3c9953a6b_pull.ipc
[DEBUG   ] Minion 'ch3ll-ec2-rhel6' trying to tune in
[ERROR   ] DNS lookup of 'salt' failed.
[ERROR   ] Master hostname: 'salt' not found. Retrying in 30 seconds