various updates

active/software_podman/podman.md

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+# Podman
+
+## Networks
+
+```bash
+# Create a podman network to group shared containers
+podman network create test1
+# Create an iperf3 container running on that network
+podman run -d --name iperf3 --network test1 docker.io/networkstatic/iperf3 -s
+# A container running in the same network can reference another pod by its name
+podman run --rm -it --network test1 docker.io/networkstatic/iperf3 -c iperf3
+# A container outside the created network can't talk to other containers
+# This will fail
+podman run --rm -it docker.io/networkstatic/iperf3 -c iperf3
+```
+
+## Healthchecks
+
+TCP Healthchecks can be accomplished with netcat (netcat-openbsd)
+
+```bash
+podman run -d --name iperf3 \
+--health-cmd='CMD-SHELL iperf3 -n 1 -c localhost' \
+--health-interval=10s --health-timeout=5s --health-retries=3 \
+docker.io/networkstatic/iperf3 iperf3 -s
+```
+
+HTTP Healthchecks can be accomplished with curl
+
+```bash
+podman run -d --name nginx \
+--health-cmd='CMD-SHELL curl --fail http://127.0.0.1:80 || exit 1' \
+--health-interval=10s --health-timeout=5s --health-retries=3 \
+docker.io/nginx
+```
+
+Check healthchecks with
+
+```bash
+podman --log-level debug healthcheck run <container>
+```
+
+## Volume Import and Export
+
+```bash
+podman volume export myvol --output myvol.tar
+podman volume import myvol test.tar
+```