fix centos 6.10 yum bug and update jdk8.rpm download url (#3398)

docker/base/Dockerfile

@@ -2,9 +2,20 @@ FROM centos:centos6.10
 
 MAINTAINER agapple (jianghang115@gmail.com)
 
-env DOWNLOAD_LINK="http://download.oracle.com/otn-pub/java/jdk/8u181-b13/96a7b8442fe848ef90c96a2fad6ed6d1/jdk-8u181-linux-x64.rpm"
+env DOWNLOAD_LINK="https://download.oracle.com/otn-pub/java/jdk/8u281-b09/89d678f2be164786b292527658ca1605/jdk-8u281-linux-x64.rpm"
 # install system
 
+# update yum config, fix "centos6.x yum install failure && Determining fastest mirrors slow" problems
+COPY yum/ /tmp/
+RUN \
+    /bin/cp /etc/yum.repos.d/CentOS-Base.repo /etc/yum.repos.d/CentOS-Base.repo.bak && \
+    /bin/cp -f /tmp/CentOS-Base.repo /etc/yum.repos.d/CentOS-Base.repo && \
+    /bin/cp /etc/yum/pluginconf.d/fastestmirror.conf /etc/yum/pluginconf.d/fastestmirror.conf.bak && \
+    awk '{ if($0=="enabled=1"){print "enabled=0";} else{print $0;} }' /etc/yum/pluginconf.d/fastestmirror.conf.bak > /etc/yum/pluginconf.d/fastestmirror.conf && \
+    /bin/cp /etc/yum.conf /etc/yum.conf.bak && \
+    echo 'minrate=1' >> /etc/yum.conf && echo 'timeout=600' >> /etc/yum.conf && \
+    yum clean all && yum makecache
+
 RUN \
     /bin/cp -f /usr/share/zoneinfo/Asia/Shanghai /etc/localtime && \
     echo 'root:Hello1234' | chpasswd && \

docker/base/yum/CentOS-Base.repo

@@ -0,0 +1,66 @@
+# CentOS-Base.repo
+#
+# The mirror system uses the connecting IP address of the client and the
+# update status of each mirror to pick mirrors that are updated to and
+# geographically close to the client.  You should use this for CentOS updates
+# unless you are manually picking other mirrors.
+#
+# If the mirrorlist= does not work for you, as a fall back you can try the
+# remarked out baseurl= line instead.
+#
+
+[base]
+name=CentOS-$releasever - Base
+failovermethod=priority
+#mirrorlist=http://mirrorlist.centos.org/?release=$releasever&arch=$basearch&repo=os&infra=$infra
+baseurl=https://mirrors.aliyun.com/centos-vault/centos/$releasever/os/$basearch/
+        https://mirrors.cloud.tencent.com/centos/$releasever/os/$basearch/
+        https://vault.centos.org/centos/$releasever/os/$basearch/
+gpgcheck=1
+gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-CentOS-6
+
+#released updates
+[updates]
+name=CentOS-$releasever - Updates
+failovermethod=priority
+#mirrorlist=http://mirrorlist.centos.org/?release=$releasever&arch=$basearch&repo=updates&infra=$infra
+baseurl=https://mirrors.aliyun.com/centos-vault/centos/$releasever/updates/$basearch/
+        https://mirrors.cloud.tencent.com/centos/$releasever/updates/$basearch/
+        https://vault.centos.org/centos/$releasever/updates/$basearch/
+gpgcheck=1
+gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-CentOS-6
+
+#additional packages that may be useful
+[extras]
+name=CentOS-$releasever - Extras
+failovermethod=priority
+#mirrorlist=http://mirrorlist.centos.org/?release=$releasever&arch=$basearch&repo=extras&infra=$infra
+baseurl=https://mirrors.aliyun.com/centos-vault/centos/$releasever/extras/$basearch/
+        https://mirrors.cloud.tencent.com/centos/$releasever/extras/$basearch/
+        https://vault.centos.org/centos/$releasever/extras/$basearch/
+gpgcheck=1
+gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-CentOS-6
+
+#additional packages that extend functionality of existing packages
+[centosplus]
+name=CentOS-$releasever - Plus
+failovermethod=priority
+#mirrorlist=http://mirrorlist.centos.org/?release=$releasever&arch=$basearch&repo=centosplus&infra=$infra
+baseurl=https://mirrors.aliyun.com/centos-vault/centos/$releasever/centosplus/$basearch/
+        https://mirrors.cloud.tencent.com/centos/6.0/centosplus/$basearch/
+        https://vault.centos.org/centos/$releasever/centosplus/$basearch/
+gpgcheck=1
+enabled=0
+gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-CentOS-6
+
+#contrib - packages by Centos Users
+[contrib]
+name=CentOS-$releasever - Contrib
+failovermethod=priority
+#mirrorlist=http://mirrorlist.centos.org/?release=$releasever&arch=$basearch&repo=contrib&infra=$infra
+baseurl=https://mirrors.aliyun.com/centos-vault/centos/$releasever/contrib/$basearch/
+        https://mirrors.cloud.tencent.com/centos/$releasever/contrib/$basearch/
+        https://vault.centos.org/centos/$releasever/contrib/$basearch/
+gpgcheck=1
+enabled=0
+gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-CentOS-6