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--- docker-command [2026/04/08 16:49] – admin
+++ docker-command [2026/04/08 22:10] (current) – admin
@@ Line 14: / Line 14: @@
 docker image save fueltracker_app >image.tgz
 </code>
-===== SSL/TLS connection =====
-==== Generate a CA, server, and client certificate/key pair ====
-. Create a working directory
-  mkdir -p ~/.docker/tls && cd ~/.docker/tls
-. Generate the CA private key
-  openssl genrsa -aes256 -out ca-key.pem 4096
-. Generate the CA certificate
-  openssl req -new -x509 -days 365 -key ca-key.pem -sha256 -out ca.pem
-You'll be prompted for a passphrase and subject info (Country, CN, etc.).
-. Generate the server private key
-  openssl genrsa -out server-key.pem 4096
-. Generate the server CSR (Certificate Signing Request)
-  openssl req -subj "/CN=<your-server-hostname-or-IP>" -sha256 -new -key server-key.pem -out server.csr
-Replace <your-server-hostname-or-IP> with your Docker host's hostname or IP (e.g., mydockerhost or 192.168.1.10).
-. Create a SANs (Subject Alternative Names) extension file
-  echo subjectAltName = DNS:<hostname>,IP:<IP>,IP:127.0.0.1 > extfile.cnf
-  echo extendedKeyUsage = serverAuth >> extfile.cnf
-Add all hostnames/IPs clients will use to reach the server.
-. Sign the server certificate with the CA
-  openssl x509 -req -days 365 -sha256 \
-    -in server.csr -CA ca.pem -CAkey ca-key.pem \
-    -CAcreateserial -out server-cert.pem -extfile extfile.cnf
-. Generate the client private key
-  openssl genrsa -out key.pem 4096
-. Generate the client CSR
-  openssl req -subj '/CN=client' -new -key key.pem -out client.csr
-. Create a client extension file
-  echo extendedKeyUsage = clientAuth > extfile-client.cnf
-. Sign the client certificate with the CA
-  openssl x509 -req -days 365 -sha256 \
-    -in client.csr -CA ca.pem -CAkey ca-key.pem \
-    -CAcreateserial -out cert.pem -extfile extfile-client.cnf
-. Clean up CSRs and extension files, lock down permissions
-  rm -f client.csr server.csr extfile.cnf extfile-client.cnf
-  chmod 0400 ca-key.pem key.pem server-key.pem
-  chmod 0444 ca.pem server-cert.pem cert.pem
-After this you'll have:
-  ┌──────────────────────────────────┬───────────────────────────────────────────────────┐
-  │               File               │                      Purpose                      │
-  ├──────────────────────────────────┼───────────────────────────────────────────────────┤
-  │ ca.pem                           │ CA certificate (needed by both server and client) │
-  ├──────────────────────────────────┼───────────────────────────────────────────────────┤
-  │ server-cert.pem / server-key.pem │ Server certificate and key                        │
-  ├──────────────────────────────────┼───────────────────────────────────────────────────┤
-  │ cert.pem / key.pem               │ Client certificate and key                        │
-  └──────────────────────────────────┴───────────────────────────────────────────────────┘
-==== Configure /etc/docker/daemon.json with "tls": true, "tlscacert", "tlscert", and "tlskey" ====
-. Copy server certs to a permanent location
-  sudo mkdir -p /etc/docker/certs
-  sudo cp ~/.docker/tls/ca.pem /etc/docker/certs/
-  sudo cp ~/.docker/tls/server-cert.pem /etc/docker/certs/
-  sudo cp ~/.docker/tls/server-key.pem /etc/docker/certs/
-  sudo chmod 0444 /etc/docker/certs/ca.pem /etc/docker/certs/server-cert.pem
-  sudo chmod 0400 /etc/docker/certs/server-key.pem
-. Create or edit /etc/docker/daemon.json
-  sudo tee /etc/docker/daemon.json > /dev/null <<EOF
-  {
-    "tls": true,
-    "tlsverify": true,
-    "tlscacert": "/etc/docker/certs/ca.pem",
-    "tlscert": "/etc/docker/certs/server-cert.pem",
-    "tlskey": "/etc/docker/certs/server-key.pem",
-    "hosts": ["unix:///var/run/docker.sock", "tcp://0.0.0.0:2376"]
-  }
-  EOF
-  - "tls": true — enables TLS but allows unauthenticated clients
-  - "tlsverify": true — enforces mutual TLS (clients must present a valid cert)
-  - Port 2376 is the standard TLS Docker port (2375 is unencrypted)
-. Handle the hosts conflict with systemd (WSL/Linux)
-If Docker is managed by systemd, the -H flag in the service file conflicts with hosts in daemon.json. Override it:
-  sudo mkdir -p /etc/systemd/system/docker.service.d
-  sudo tee /etc/systemd/system/docker.service.d/override.conf > /dev/null <<EOF
-  [Service]
-  ExecStart=
-  ExecStart=/usr/bin/dockerd
-  EOF
-. Reload and restart Docker
-  sudo systemctl daemon-reload
-  sudo systemctl restart docker
-. Verify Docker is listening on port 2376
-  sudo ss -tlnp | grep 2376
-You should see dockerd bound to 0.0.0.0:2376. That confirms TLS is active and the daemon is accepting remote connections.
 ===== References =====

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