diff --git a/.dockerignore b/.dockerignore
index dbcea137316718..290780ffe453fa 100644
--- a/.dockerignore
+++ b/.dockerignore
@@ -15,3 +15,4 @@
 !shell.nix
 !vcpkg-configuration.json
 !vcpkg.json
+!dockerfiles/CentOS-Base.repo
diff --git a/.github/workflows/prebuild-docker.yml b/.github/workflows/prebuild-docker.yml
index a67d3bd8903574..3c57717d17acf6 100644
--- a/.github/workflows/prebuild-docker.yml
+++ b/.github/workflows/prebuild-docker.yml
@@ -27,6 +27,7 @@ jobs:
             "ubuntu-20.04",
             "rockylinux-8",
             "centos-8",
+            "centos-7"
           ]
       fail-fast: false
 
diff --git a/dockerfiles/CentOS-Base.repo b/dockerfiles/CentOS-Base.repo
new file mode 100644
index 00000000000000..66ec9ac2b943eb
--- /dev/null
+++ b/dockerfiles/CentOS-Base.repo
@@ -0,0 +1,45 @@
+# /etc/yum.repos.d/CentOS-Base.repo
+
+[base]
+name=CentOS-$releasever - Base
+baseurl=http://vault.centos.org/7.9.2009/os/$basearch/
+gpgcheck=1
+gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-CentOS-7
+
+[updates]
+name=CentOS-$releasever - Updates
+baseurl=http://vault.centos.org/7.9.2009/updates/$basearch/
+gpgcheck=1
+gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-CentOS-7
+
+[extras]
+name=CentOS-$releasever - Extras
+baseurl=http://vault.centos.org/7.9.2009/extras/$basearch/
+gpgcheck=1
+gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-CentOS-7
+
+[centosplus]
+name=CentOS-$releasever - Plus
+baseurl=http://vault.centos.org/7.9.2009/centosplus/$basearch/
+gpgcheck=1
+gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-CentOS-7
+
+[contrib]
+name=CentOS-$releasever - Contrib
+baseurl=http://vault.centos.org/7.9.2009/contrib/$basearch/
+gpgcheck=1
+enabled=0
+gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-CentOS-7
+
+[sclo]
+name=CentOS-$releasever - sclo
+baseurl=https://vault.centos.org/7.9.2009/sclo/$basearch/sclo/
+gpgcheck=0
+gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-CentOS-7
+
+[rh]
+name=CentOS-$releasever - rh
+baseurl=https://vault.centos.org/7.9.2009/sclo/$basearch/rh/
+gpgcheck=0
+gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-CentOS-7
+
diff --git a/dockerfiles/centos-7.dockerfile b/dockerfiles/centos-7.dockerfile
index 124cac0fb9d513..55ded29d8a0388 100644
--- a/dockerfiles/centos-7.dockerfile
+++ b/dockerfiles/centos-7.dockerfile
@@ -1,9 +1,12 @@
 FROM centos:centos7.9.2009 AS base_build
 
+COPY dockerfiles/CentOS-Base.repo /etc/yum.repos.d/CentOS-Base.repo
+
 # Build Tools  ---
+RUN yum clean all && yum update -y && yum install -y \
+    https://packages.endpointdev.com/rhel/7/os/x86_64/endpoint-repo.x86_64.rpm
+
 RUN yum update -y && yum install -y \
-    centos-release-scl \
-    https://packages.endpointdev.com/rhel/7/os/x86_64/endpoint-repo.x86_64.rpm && \
     yum group install -y "Development Tools" && yum install -y \
     autoconf \
     autoconf-archive \
@@ -18,10 +21,9 @@ RUN yum update -y && yum install -y \
     unzip \
     yum-utils \
     zip && \
+    yum install -y devtoolset-11 && \
     yum -y clean all && rm -rf /var/cache
 
-RUN yum install -y devtoolset-11
-
 RUN echo "source /opt/rh/devtoolset-11/enable" >> /etc/bashrc
 SHELL ["/bin/bash", "--login", "-c"]