Code to create & locally save a centos6 container, while it still exists

science-containers/Dockerfiles/casa/centos6/CentOS-Base.repo

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+[base]
+name=CentOS-$releasever - Base
+# mirrorlist=http://mirrorlist.centos.org/?release=$releasever&arch=$basearch&repo=os&infra=$infra
+# baseurl=http://mirror.centos.org/centos/$releasever/os/$basearch/
+baseurl=https://vault.centos.org/6.10/os/$basearch/
+gpgcheck=1
+gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-CentOS-6
+
+# released updates
+[updates]
+name=CentOS-$releasever - Updates
+# mirrorlist=http://mirrorlist.centos.org/?release=$releasever&arch=$basearch&repo=updates&infra=$infra
+# baseurl=http://mirror.centos.org/centos/$releasever/updates/$basearch/
+baseurl=https://vault.centos.org/6.10/updates/$basearch/
+gpgcheck=1
+gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-CentOS-6
+
+# additional packages that may be useful
+[extras]
+name=CentOS-$releasever - Extras
+# mirrorlist=http://mirrorlist.centos.org/?release=$releasever&arch=$basearch&repo=extras&infra=$infra
+# baseurl=http://mirror.centos.org/centos/$releasever/extras/$basearch/
+baseurl=https://vault.centos.org/6.10/extras/$basearch/
+gpgcheck=1
+gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-CentOS-6

science-containers/Dockerfiles/casa/centos6/Dockerfile

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+FROM centos:6
+#this Dockerfile runs through the build of a centos6 container and saves it
+# to images.canfar.net, to use as a base for the subsequent builds of older
+# casa versions, because the web-based centos6 distributions are becoming
+# unstable and unmaintained
+
+# Override old repo info with current urls
+RUN rm /etc/yum.repos.d/CentOS-Base.repo
+ADD CentOS-Base.repo /etc/yum.repos.d/
+
+RUN yum clean all -y
+RUN yum makecache -y
+RUN yum update -y
+RUN yum install -y freetype libSM libXi libXrender libXrandr \
+	libXfixes libXcursor libXinerama fontconfig \
+        libxslt xauth xorg-x11-server-Xvfb dbus-x11 \
+	tkinter ImageMagick-c++ xterm perl autoconf python-sphinx graphviz
+
+RUN yum install -y sssd-client acl
+

science-containers/Dockerfiles/casa/centos6/Makefile

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+
+VERSIONS = \
+	6
+
+
+DOCKER_REPO_BASE=images.canfar.net/skaha/centos
+
+.PHONY: build clean run 
+
+all: build
+
+build: 
+	@- $(foreach V,$(VERSIONS), \
+		docker build -t ${DOCKER_REPO_BASE}:$(V) .; \
+    	)
+
+clean:
+	@- $(foreach V,$(VERSIONS), \
+	  docker rmi ${DOCKER_REPO_BASE}:$(V) ; \
+	)
+
+
+upload: build
+	@- $(foreach V,$(VERSIONS), \
+	  docker push ${DOCKER_REPO_BASE}:$(V) ; \
+	)
+clean_all: clean
+upload_all: upload