Setup Cosmovisor

For mainnet, it's recommended to use Cosmovisor to run your node. If you've not used it before, then run it during a testnet to check you can get it set up correctly.

Setting up Cosmovisor is relatively straightforward. However, it does expect certain environment variables and folder structures to be set.

Cosmovisor allows you to download binaries ahead of time for chain upgrades, meaning that you can do zero (or close to zero) downtime chain upgrades. It's also useful if your local timezone means that a chain upgrade will fall at a bad time.

Rather than having to do stressful ops tasks late at night, it's always better if you can automate them away, and that's what Cosmovisor tries to do.

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Install

First, go and get cosmovisor (recommended approach):

go install github.com/cosmos/cosmos-sdk/cosmovisor/cmd/cosmovisor@v1.0.0

Your installation can be confirmed with:

which cosmovisor

This will return something like:

/home/<your-user>/go/bin/cosmovisor

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Add environment variables to your shell

In the .zshrc file, usually located at ~/.zshrc, add:

# cosmovisor - Cheqd
export DAEMON_NAME=dymd
export DAEMON_HOME=$HOME/.dymension

Then source your profile to have access to these variables:

source ~/.zshrc

You can confirm success like so:

echo $DAEMON_NAME

It should return archwayd.

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Set up the folder structure

Cosmovisor expects a certain folder structure:

.
├── current -> genesis or upgrades/<name>
├── genesis
│   └── bin
│       └── $DAEMON_NAME
└── upgrades
    └── <name>
        └── bin
            └── $DAEMON_NAME

Don't worry about current - that is simply a symlink used by Cosmovisor. The other folders will need setting up, but this is easy:

mkdir -p ~/.ssc/cosmovisor/genesis/bin 
mkdir -p ~/.ssc/cosmovisor/upgrades

# Change Ownership of newly created folders
sudo chown -R user:user ~/.ssc/cosmovisor

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Set up genesis binary

Cosmovisor needs to know which binary to use at genesis. We put this in $DAEMON_HOME/cosmovisor/genesis/bin.

First, find the location of the binary you want to use:

which sscd

Then use the path returned to copy it to the directory Cosmovisor expects. Let's assume the previous command returned /home/your-user/go/bin/dymd:

cp $GOPATH/bin/sscd ~/.ssc/cosmovisor/genesis/bin

Once you're done, check the folder structure looks correct using a tool like tree.

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Set up service

Commands sent to Cosmovisor are sent to the underlying binary. For example, cosmovisor version is the same as typing dymd version.

Nevertheless, just as we would manage dymd using a process manager, we would like to make sure Cosmovisor is automatically restarted if something happens, for example, an error or reboot.

First, create the service file:

sudo nano /etc/systemd/system/saga.service

Change the contents of the below to match your setup - cosmovisor is likely at ~/go/bin/cosmovisor regardless of which installation path you took above, but it's worth checking.

[Unit]
Description=cosmovisor - dymension
After=network-online.target
[Service]
User=user
ExecStart=/home/user/go/bin/cosmovisor start
Restart=always
RestartSec=3
LimitNOFILE=4096
Environment="DAEMON_NAME=dymd"
Environment="DAEMON_HOME=/home/user/.dymension"
Environment="DAEMON_ALLOW_DOWNLOAD_BINARIES=false"
Environment="DAEMON_RESTART_AFTER_UPGRADE=true"
Environment="DAEMON_LOG_BUFFER_SIZE=512"
Environment="UNSAFE_SKIP_BACKUP=true"
[Install]
WantedBy=multi-user.target

Note also that we set buffer size explicitly because of a live bug in Cosmovisor before version v1.0.0. If you are using v1.0.0, you may omit that line.

In addition, the same issue can be fixed by reducing the log via env variable. If you are unsure, ask on Discord.

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Start Cosmovisor

Finally, enable the service and start it.

sudo -S systemctl daemon-reload
sudo -S systemctl enable saga 
sudo systemctl start saga

Check it is running using:

sudo systemctl status saga

If you need to monitor the service after launch, you can view the logs using:

journalctl -fu saga