Added debugging packages to Docker images (#13124)

build.assets/charts/Dockerfile

@@ -5,11 +5,43 @@ FROM ubuntu:20.04
 # package is installed because the base Ubuntu image does not come with any
 # certificate authorities. libelf1 is a dependency introduced by Teleport 7.0.
 #
+# The below packages are provided for debug purposes. Installing them adds around
+#  six megabytes to the image size. The packages include the following commands:
+# * net-tools
+#   * netstat
+#   * ifconfig
+#   * ipmaddr
+#   * iptunnel
+#   * mii-tool
+#   * nameif
+#   * plipconfig
+#   * rarp
+#   * route
+#   * slattach
+#   * arp
+# * iputils-ping
+#   * ping
+#   * ping4
+#   * ping6
+# * inetutils-telnet
+#   * telnet
+# * netcat
+#   * netcat
+# * tcpdump
+#   * tcpdump
+# * busybox (see "busybox --list" for all provided utils)
+#   * less
+#   * nslookup
+#   * vi
+#   * wget
+
 # Note that /var/lib/apt/lists/* is cleaned up in the same RUN command as
 # "apt-get update" to reduce the size of the image.
 RUN apt-get update && \
     DEBIAN_FRONTEND=noninteractive apt-get upgrade -y && \
     DEBIAN_FRONTEND=noninteractive apt-get install --no-install-recommends -y ca-certificates dumb-init libelf1 && \
+    DEBIAN_FRONTEND=noninteractive apt-get install --no-install-recommends -y net-tools iputils-ping inetutils-telnet netcat tcpdump busybox && \
+    busybox --install -s && \
     update-ca-certificates && \
     apt-get -y clean && \
     rm -rf /var/lib/apt/lists/*

build.assets/charts/Dockerfile-fips

@@ -5,11 +5,43 @@ FROM ubuntu:20.04
 # package is installed because the base Ubuntu image does not come with any
 # certificate authorities. libelf1 is a dependency introduced by Teleport 7.0.
 #
+# The below packages are provided for debug purposes. Installing them adds around
+#  six megabytes to the image size. The packages include the following commands:
+# * net-tools
+#   * netstat
+#   * ifconfig
+#   * ipmaddr
+#   * iptunnel
+#   * mii-tool
+#   * nameif
+#   * plipconfig
+#   * rarp
+#   * route
+#   * slattach
+#   * arp
+# * iputils-ping
+#   * ping
+#   * ping4
+#   * ping6
+# * inetutils-telnet
+#   * telnet
+# * netcat
+#   * netcat
+# * tcpdump
+#   * tcpdump
+# * busybox (see "busybox --list" for all provided utils)
+#   * less
+#   * nslookup
+#   * vi
+#   * wget
+#
 # Note that /var/lib/apt/lists/* is cleaned up in the same RUN command as
 # "apt-get update" to reduce the size of the image.
 RUN apt-get update && \
     DEBIAN_FRONTEND=noninteractive apt-get upgrade -y && \
     DEBIAN_FRONTEND=noninteractive apt-get install --no-install-recommends -y ca-certificates dumb-init libelf1 && \
+    DEBIAN_FRONTEND=noninteractive apt-get install --no-install-recommends -y net-tools iputils-ping inetutils-telnet netcat tcpdump busybox && \
+    busybox --install -s && \
     update-ca-certificates && \
     apt-get -y clean && \
     rm -rf /var/lib/apt/lists/*