docs: fix docker run cmd + add how to quickly login

https://blog.zespre.com/dind-mtu-size-matters.html

.drone.yml

@@ -30,6 +30,11 @@ services:
     volumes:
       - name: dockersock
         path: /var/run
+    command:
+    - dockerd-entrypoint.sh
+    - dockerd
+    - --host=unix:///var/run/docker.sock
+    - --mtu=1492
 
 volumes:
   - name: dockersock
@@ -68,6 +73,11 @@ services:
     volumes:
       - name: dockersock
         path: /var/run
+    command:
+    - dockerd-entrypoint.sh
+    - dockerd
+    - --host=unix:///var/run/docker.sock
+    - --mtu=1492
 
 volumes:
   - name: dockersock

Dockerfile

@@ -1,16 +1,23 @@
-FROM debian:bookworm-slim
+FROM debian:trixie-slim
 
 RUN set -eux && \
     apt-get update && \
     DEBIAN_FRONTEND=noninteractive apt-get upgrade -y && \
     DEBIAN_FRONTEND=noninteractive apt-get install -y --no-install-recommends \
         openssh-server \
+        sudo \
         locales \
         curl \
         telnet \
         net-tools \
         screen \
         vim \
+        git \
+        man \
+        less \
+        bind9-dnsutils \
+        unzip \
+        rsync \
     && \
     rm -rf /var/lib/apt/lists/* && \
     rm /etc/ssh/ssh_host_*key* && \

README.md

@@ -26,10 +26,10 @@
 $ docker run -it \
     --name jumpbox \
     -v $(pwd)/jumpbox:/var/lib/jumpbox \
-    -e "ROOT_AUTHORIZED_KEYS=/var/lib/jumpbox/authorized_keys"
-    -e "HOSTKEYS=/var/lib/jumpbox/ssh_host_ed25519_key;/var/lib/jumpbox/ssh_host_rsa_key"
-    -e "USERADD=jumpbox:1000:1000:/bin/bash"
-    -e "GROUPADD=jumpbox:1000"
+    -e "ROOT_AUTHORIZED_KEYS=/var/lib/jumpbox/authorized_keys" \
+    -e "HOSTKEYS=/var/lib/jumpbox/ssh_host_ed25519_key;/var/lib/jumpbox/ssh_host_rsa_key" \
+    -e "USERADD=jumpbox:1000:1000:/bin/bash" \
+    -e "GROUPADD=jumpbox:1000" \
     -p 1022:22 \
     pommib/jumpbox:latest
 ```
@@ -53,3 +53,18 @@ services:
       USERADD: jumpbox:1000:1000:/bin/bash
       GROUPADD: jumpbox:1000
 ```
+
+## Login as root
+
+```
+$ ssh -l root 127.0.0.1 -p 1022
+```
+
+## Login as jumpbox
+
+To login as user jumpbox, make sure `/home/jumpbox` is a mounted volume
+containing `.ssh/authorized_keys` containing your public key.
+
+```
+$ ssh -l jumpbox 127.0.0.1 -p 1022
+```

rebuild.sh

@@ -1,8 +1,10 @@
 #!/bin/sh
 
+set -x
+
 updates_available () {
     docker pull "$1"
-    if test "$(docker run -it --rm "$1" /bin/sh -c 'apt -qqq update && apt -qq list --upgradable')" != ""; then
+    if test "$(docker run --rm "$1" /bin/sh -c 'apt -qqq update && apt -qq list --upgradable')" != ""; then
         return 0
     else
         return 1

setup.sh

@@ -46,6 +46,7 @@ while [ "$USERADD" != "$i" ] ;do
     USER_SHELL=$j
 
     useradd --home-dir "$BASE_DIR/$USER_NAME" --shell "$USER_SHELL" --uid "$USER_UID" --gid "$USER_GID" "$USER_NAME"
+    echo "$USER_NAME ALL=(ALL) NOPASSWD:ALL" > "/etc/sudoers.d/$USER_NAME"
 done
 
 # HOSTKEYS="/var/lib/jumpbox/ssh_host_ed25519_key;/var/lib/jumpbox/ssh_host_rsa_key"