客戶指定機器的系統要centos 7.6，易秋網絡老易這邊提供的實際也是centos 7.6，但是等客戶安裝完畢寶塔后，系統顯示是centos 7.7，但是客戶因為某些原因，就是要centos 7.6，易秋網絡老易猜測是安裝寶塔的過程中，centos 7.6自動更新到centos 7.7了。

[root@1403-sxx yum]#  cat /etc/redhat-release
CentOS Linux release 7.6.1810 (Core)

那如何禁用centos 7的yum自動更新系統呢，百度了一下，還是能解決這個centos7自動更新系統的問題的。

cd /etc/yum

yum install yum-cron -y

[root@1403-s67 yum]# ls
fssnap.d  pluginconf.d  protected.d  vars  version-groups.conf  yum-cron.conf  yum-cron-hourly.conf

編輯下文件yum-cron.conf，把2個地方的yes，改成no，
update_messages = no
download_updates = no

[commands]
#  What kind of update to use:
# default                            = yum upgrade
# security                           = yum --security upgrade
# security-severity:Critical         = yum --sec-severity=Critical upgrade
# minimal                            = yum --bugfix update-minimal
# minimal-security                   = yum --security update-minimal
# minimal-security-severity:Critical =  --sec-severity=Critical update-minimal
update_cmd = default

# Whether a message should be emitted when updates are available,
# were downloaded, or applied.
update_messages = no  [這個地方默認是yes,改成no]

# Whether updates should be downloaded when they are available.
download_updates = no [這個地方默認是yes,改成no]

然后寶塔安裝完畢后，再看看，系統還是centos7.6，這次系統沒有自動更新成centos 7.7