v7 Upgrade Guide (#978)

* v7 guide

* switch cosmovisor installation method

networks/osmosis-1/upgrades/v7/guide.md

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+# v6 to v7 Upgrade Guide
+
+
+## Memory Requirements
+
+For this upgrade, nodes will need a total of 64GB of memory. This must consist of a **minimum** of 32GB of RAM, while the remaining 32GB can be swap. For best results, use 64GB of physical memory.
+
+
+Short version swap setup instructions:
+```sh
+sudo swapoff -a
+sudo fallocate -l 32G /swapfile
+sudo chmod 600 /swapfile
+sudo mkswap /swapfile
+sudo swapon /swapfile
+```
+
+To persist swap after restart:
+```sh
+sudo cp /etc/fstab /etc/fstab.bak
+echo '/swapfile none swap sw 0 0
+```
+
+In depth swap setup instructions: https://www.digitalocean.com/community/tutorials/how-to-add-swap-space-on-ubuntu-20-04
+
+
+## Install and setup Cosmovisor
+
+We highly recommend validators use cosmovisor to run their nodes. This will make low-downtime upgrades smoother, as validators don't have to manually upgrade binaries during the upgrade, and instead can pre-install new binaries, and cosmovisor will automatically update them based on on-chain SoftwareUpgrade proposals.
+
+You should review the docs for cosmovisor located here: https://docs.cosmos.network/master/run-node/cosmovisor.html
+
+If you choose to use cosmovisor, please continue with these instructions:
+
+To install Cosmovisor:
+
+```sh
+go install github.com/cosmos/cosmos-sdk/cosmovisor/cmd/[email protected]
+```
+
+After this, you must make the necessary folders for cosmosvisor in your daemon home directory (~/.osmosisd).
+
+```sh
+mkdir -p ~/.osmosisd
+mkdir -p ~/.osmosisd/cosmovisor
+mkdir -p ~/.osmosisd/cosmovisor/genesis
+mkdir -p ~/.osmosisd/cosmovisor/genesis/bin
+mkdir -p ~/.osmosisd/cosmovisor/upgrades
+```
+
+Cosmovisor requires some ENVIRONMENT VARIABLES be set in order to function properly.  We recommend setting these in your `.profile` so it is automatically set in every session.
+
+For validators we recommmend setting
+- `DAEMON_ALLOW_DOWNLOAD_BINARIES=false` for security reasons
+- `DAEMON_LOG_BUFFER_SIZE=512` to avoid a bug with extra long log lines crashing the server.
+- `DAEMON_RESTART_AFTER_UPGRADE=true` for unattended upgrades
+
+```
+echo "# Setup Cosmovisor" >> ~/.profile
+echo "export DAEMON_NAME=osmosisd" >> ~/.profile
+echo "export DAEMON_HOME=$HOME/.osmosisd" >> ~/.profile
+echo "export DAEMON_ALLOW_DOWNLOAD_BINARIES=false" >> ~/.profile
+echo "export DAEMON_LOG_BUFFER_SIZE=512" >> ~/.profile
+echo "export DAEMON_RESTART_AFTER_UPGRADE=true" >> ~/.profile
+echo "export UNSAFE_SKIP_BACKUP=true" >> ~/.profile
+source ~/.profile
+```
+You may leave out `UNSAFE_SKIP_BACKUP=true`, however the backup takes a decent amount of time and public snapshots of old states are available.
+
+Finally, you should copy the current osmosisd binary into the cosmovisor/genesis folder.
+```
+cp $GOPATH/bin/osmosisd ~/.osmosisd/cosmovisor/genesis/bin
+```
+
+
+## Prepare for upgrade (v7)
+
+To prepare for the upgrade, you need to create some folders, and build and install the new binary.
+
+```
+mkdir -p ~/.osmosisd/cosmovisor/upgrades/v7/bin
+cd $HOME/osmosis
+git pull
+git checkout v7.0.0
+make build
+cp build/osmosisd ~/.osmosisd/cosmovisor/upgrades/v7/bin
+```
+
+Now cosmovisor will run with the current binary, and will automatically upgrade to this new binary at the appropriate height if run with:
+```
+cosmovisor start
+```
+
+Please note, this does not automatically update your `$GOPATH/bin/osmosisd` binary, to do that after the upgrade, please run `make install` in the osmosis source folder.
+
+
+## Further Help
+
+If you need more help, please go to https://docs.osmosis.zone or join our discord at https://discord.gg/pAxjcFnAFH.