Solana Testnet Restart - 01 January 2022

Important: Instruction is valid only during restart. Please use your common service file if network already started.

Testnet 1.8.11 Restart
(If you are running Solana v1.8.10 or earlier, please upgrade to v1.8.11 or keep 1.9.2)

The restart will start from the highest finalized slot.

$ solana slot -ul --commitment finalized
110973418

Note: If your last finalized slot is lower than that the one listed below, this is likely your node crashed before it was able to observe the latest supermajority. Follow the instructions in the appendix

The known validator arguments provided below are validators who have the last finalized slot and are providing snapshots for it, don’t keep them in your list as known validators after the restart as these are community validators not Solana Foundation nodes.

Important: DO NOT delete your ledger directory

## Step 0: Stop the validator service

**IMPORTANT:** ⚠️MAKE SURE TO STOP YOUR VALIDATOR BEFORE DOING ANYTHING ELSE.⚠️

**IMPORTANT:** ⚠️DO NOT delete your ledger directory.⚠️

**NOTE:** *Upgrade to v1.8.11 if you are running older Solana version or keep 1.9.1 if you already on it.* 

## Step 1: 

Step 1: Create a snapshot at slot 110973418
This document assumes your ledger directory is called ledger/.  If not then adjust the following commands accordingly.

Use the ledger tool to create a new snapshot at slot 110973418, replacing the two instances of <ledger path> to your actual ledger path:

$ solana-ledger-tool --ledger <ledger path> create-snapshot 110973418 <ledger path> --hard-fork 110973418

Or else, if you use separate directory for snapshots:

$ solana-ledger-tool --ledger <ledger path> create-snapshot 110973418 <snapshots path> --hard-fork 110973418 --snapshot-archive-path <snapshots path>

Add --snapshot-archive-path before “create-snapshot” if you have a separate snapshot dir, and --accounts after “create-snapshot” if you have a separate accounts dir
 
The final line of output should be “Shred version: 12339”, and this snapshot file should now exist: 
ledger/snapshot-110973418-9EYXPxetV4r1B1WVsPqHczGwb5hWGHTxP2WiGSbi9zp6.tar.zst

Check your ledger/ directory to ensure that you have no snapshot newer than ledger/snapshot-110973418-..... This is very unlikely, but if found should be removed. Snapshots older than ledger/snapshot-110973418-.. should not be removed.

NOTE: If you receive “Error: Slot 110973418 is not available”, please see appendix

Step 2: Adjust your validator command-line arguments, temporarily for this restart to include:

--wait-for-supermajority 110973418 \
--no-snapshot-fetch \
--no-genesis-fetch \
--expected-bank-hash WVDsuJJbhcdqH6vQrpZi5GYoPnMAaKw4THMtwes77DS \
--expected-shred-version 12339 \
--entrypoint 5.9.35.85:8001 \
--entrypoint entrypoint.testnet.solana.com:8001 \
--entrypoint entrypoint2.testnet.solana.com:8001 \
--entrypoint entrypoint3.testnet.solana.com:8001 \
--known-validator eoKpUABi59aT4rR9HGS3LcMecfut9x7zJyodWWP43YQ \
--known-validator 4z755TDizaUVyRRKw7y8DnTnnon8ksQYsZyU3feF6yFc \
--known-validator Bszp6hDL19ymPZ8efp9venQYb4ae2rRmEtVp4aG6k8nx \
--known-validator 8SRKNfvMerfA1BdU79CAwU4wNfjnDvFrBo3o5f5TS4uv \

(Remove the previous value of “--expected-shred-version“ if present)

Once the cluster restarts and normal operation resumes, remember to remove these arguments. They are only required for the restart. 

Step 3: Start your validator
As it boots, it will load the snapshot for slot 110973418 and wait for 80% of the stake to come online before producing/validating new blocks. 

To confirm your restarted validator is correctly waiting for 80% stake, look for this periodic log message to confirm it is waiting:
INFO  solana_core::validator] Waiting for 80% of activated stake at slot 110973418 to be in gossip...

And if you have RPC enabled, ask it repeated for the current slot:
$ solana --url http://127.0.0.1:8899 slot

Any number other than 110973418 means you did not complete the steps correctly.



Appendix: Resolution if you did not preserve your ledger or your last optimistically confirmed slot is below 110973418

NOT RECOMMENDED - this resolution should only be attempted if your ledger/ directory is unavailable. 

If your ledger history is corrupt or otherwise unavailable, delete your ledger/ directory instead of Steps 1 & 2, then complete Steps 3.

OBS: remove --no-snapshot-fetch  if set

Add these arguments to restart:


--wait-for-supermajority 110973418 \
--expected-shred-version 12339 \
--entrypoint 5.9.35.85:8001 \
--entrypoint entrypoint.testnet.solana.com:8001 \
--entrypoint entrypoint2.testnet.solana.com:8001 \
--entrypoint entrypoint3.testnet.solana.com:8001 \
--expected-bank-hash WVDsuJJbhcdqH6vQrpZi5GYoPnMAaKw4THMtwes77DS \
--known-validator eoKpUABi59aT4rR9HGS3LcMecfut9x7zJyodWWP43YQ \
--known-validator 4z755TDizaUVyRRKw7y8DnTnnon8ksQYsZyU3feF6yFc \
--known-validator Bszp6hDL19ymPZ8efp9venQYb4ae2rRmEtVp4aG6k8nx \
--known-validator 8SRKNfvMerfA1BdU79CAwU4wNfjnDvFrBo3o5f5TS4uv \