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60 lines
2.4 KiB
Bash
Executable File
60 lines
2.4 KiB
Bash
Executable File
#!/bin/bash
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# After opening a Wireguard connection to your Fly network, run this script to
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# open a BEAM Observer from your local machine to the remote server. This creates
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# a local node that is clustered to a machine running on Fly.
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# In order for it to work:
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# - Your wireguard connection must be up.
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# - The RELEASE_COOKIE value must be the same as the cookie value used for your project.
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# - Observer needs to be working in your local environment. That requires WxWidget support in your Erlang install.
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# When done, close Observer. It leaves you with an open IEx shell that is connected to the remote server. You can safely CTRL+C, CTRL+C to exit it.
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set -e
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if [ -z "$RELEASE_COOKIE" ]; then
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echo "Set the RELEASE_COOKIE your project uses in the RELEASE_COOKIE ENV value before running this script."
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exit 1
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fi
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if ! command -v jq &> /dev/null; then
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echo "jq is not installed. Please install it before running this script. It is a command-line JSON processor."
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exit 1
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fi
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# Get the data we need in JSON format
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json_data=$(fly status --json)
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# Extract app name
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app_name=$(echo "$json_data" | jq -r '.Name')
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# Extract private_ip for the first started machine
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private_ip=$(echo "$json_data" | jq -r '.Machines[] | select(.state == "started") | .private_ip' | head -n 1)
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if [ -z "$private_ip" ]; then
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echo "No instances appear to be running at this time."
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exit 1
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fi
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# Assemble the full node name
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FULL_NODE_NAME="${app_name}@${private_ip}"
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echo Attempting to connect to $FULL_NODE_NAME
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# IMPORTANT:
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# ==========
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# Fly.io uses an IPv6 network internally for private IPs. The BEAM needs IPv6
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# support to be enabled explicitly.
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#
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# The issue is, if it's enabled globally like in a `.bashrc` file, then setting
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# it here essentially flips it OFF. If not set globally, then it should be set
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# here. Choose the version that fits your situation.
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#
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# It's the `--erl "-proto_dist inet6_tcp"` portion.
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# Toggles on IPv6 support for the local node being started.
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iex --erl "-proto_dist inet6_tcp" --sname my_remote --cookie ${RELEASE_COOKIE} -e "IO.inspect(Node.connect(:'${FULL_NODE_NAME}'), label: \"Node Connected?\"); IO.inspect(Node.list(), label: \"Connected Nodes\"); :observer.start"
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# Does NOT toggle on IPv6 support, assuming it is enabled some other way.
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# iex --sname my_remote --cookie ${RELEASE_COOKIE} -e "IO.inspect(Node.connect(:'${FULL_NODE_NAME}'), label: \"Node Connected?\"); IO.inspect(Node.list(), label: \"Connected Nodes\"); :observer.start"
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