Merge pull request #7 from a5an0/channel-backups

Push channel backups into S3

README.md

@@ -32,6 +32,7 @@ By default, the grpc port will not be accessible. There's a security group that
 
 Want to add a second (or third or fourth) node? Go into `bin/thundercloud.ts` and add a line at the end like `new LightningNode(app, 'SecondLightningNode', {stackName: "SecondLightningNode"});`, then do `cdk deploy SecondLightningNode`. 
 
+
 ## Shutting down the node
 1. go into the project root and do `cdk destroy`
 There is no step 2. You can also go find the stack in CloudFormation and delete it there. either way works.
@@ -42,6 +43,7 @@ There is no step 2. You can also go find the stack in CloudFormation and delete
 - When your node first boots, it'll execute `lib/configure-node.sh` as root. This is where lnd gets downloaded and configured. Feel free to tweak it to your needs.
 - All the infrastructure is defined in `lib/lightningnode-stack.ts`. You can add/remove/change things there to your liking. doing a `cdk deploy` will update the stack. Changing some instance properties will result in the node being deleted and recreated. Be careful changing the instance.
 - If you need to change the AZs that the stack uses for VPC subnets, check out the `get availabilityZones()` in `lib/lightningnode-stack.ts`
+- This stack will also create an S3 bucket to hold static channel backups, and the instance will be configured to upload a channel backup everytime it changes. You can find the name of the bucket in the stack outputs (along wih the IP and keyname). Check out `/etc/incron.d/channelbackup` to see the configuration. The `aws s3 ...` command will run whenever the `~/.lnd/data/chain/bitcoin/mainnet/channel.backup` file is closed after writing.
 
 ## FAQ
 - Why neutrino?

lib/configure-node.sh

@@ -186,6 +186,18 @@ chown -R ec2-user: /home/ec2-user/bin
 # ensure the wallet is unlocked by unlocking it every 5 minutes
 echo '*/5 * * * * ec2-user /home/ec2-user/.npm-global/bin/bos unlock /home/ec2-user/.lnd/wallet_password' >> /etc/crontab
 
+# Setup incron to backup channels whenver they're changed
+amazon-linux-extras install -y epel
+yum install -y incron jq
+REGION=$(curl http://169.254.169.254/latest/meta-data/placement/region)
+FILE_PATH=/home/ec2-user/.lnd/data/chain/bitcoin/mainnet/channel.backup
+S3_CHAN_BUCKET=$(aws --region=$REGION ssm get-parameter --name lightning.backup.bucketname | jq -r .Parameter.Value)
+echo "$FILE_PATH IN_CLOSE_WRITE aws --region=$REGION s3 cp $FILE_PATH s3://$S3_CHAN_BUCKET/channel.backup" > /etc/incron.d/channelbackup
+echo "$FILE_PATH IN_MODIFY aws --region=$REGION s3 cp $FILE_PATH s3://$S3_CHAN_BUCKET/channel.backup" >> /etc/incron.d/channelbackup
+systemctl enable incrond
+systemctl start incrond
+
+
 # Start lnd!
 systemctl enable lnd.service
 systemctl start lnd.service

lib/lightningnode-stack.ts

@@ -4,7 +4,8 @@ import {Asset} from '@aws-cdk/aws-s3-assets';
 import { KeyPair } from 'cdk-ec2-key-pair';
 import * as path from 'path';
 import { CfnEIP } from '@aws-cdk/aws-ec2';
-
+import { Bucket } from '@aws-cdk/aws-s3';
+import { ParameterTier, StringParameter } from '@aws-cdk/aws-ssm';
 
 export class LightningNode extends cdk.Stack {
   get availabilityZones(): string[] {
@@ -24,7 +25,7 @@ export class LightningNode extends cdk.Stack {
 
     // SSH key for the node
     const key = new KeyPair(this, 'KeyPair' + suffix, {
-      name: 'cdk-keypair',
+      name: 'lightning-keypair' + suffix,
       description: 'Key Pair created with CDK Deployment',
     });
     
@@ -93,11 +94,22 @@ export class LightningNode extends cdk.Stack {
     });
     setupScript.grantRead( instance.role );
 
+    const channelBucket = new Bucket(this, "ChannelBackupBucket" + suffix, {});
+    channelBucket.grantWrite(instance.role);
+
+    const bucketNameParam = new StringParameter(this, "BucketNameParam" + suffix, {
+      parameterName: "lightning.backup.bucketname",
+      stringValue: channelBucket.bucketName,
+      tier: ParameterTier.STANDARD
+    });
+    bucketNameParam.grantRead(instance.role);
+
     // These outputs get printed when you are done deploying, and can be found in the "Outputs" tab
     // of the Cloudformation stack. You can also fetch them programatically. Feel free to add more
     new cdk.CfnOutput(this, 'IP Address', { value: instance.instancePublicIp });
-    new cdk.CfnOutput(this, 'Key Name', { value: key.keyPairName })
-    new cdk.CfnOutput(this, 'Download Key Command', { value: 'aws secretsmanager get-secret-value --secret-id ec2-ssh-key/cdk-keypair/private --query SecretString --output text > cdk-key.pem && chmod 400 cdk-key.pem' })
-    new cdk.CfnOutput(this, 'ssh command', { value: 'ssh -i cdk-key.pem -o IdentitiesOnly=yes ec2-user@' + instance.instancePublicIp })
+    new cdk.CfnOutput(this, 'Key Name', { value: key.keyPairName });
+    new cdk.CfnOutput(this, 'Download Key Command', { value: 'aws secretsmanager get-secret-value --secret-id ec2-ssh-key/lightning-keypair' + suffix + '/private --query SecretString --output text > cdk-key.pem && chmod 400 cdk-key.pem' });
+    new cdk.CfnOutput(this, 'ssh command', { value: 'ssh -i cdk-key.pem -o IdentitiesOnly=yes ec2-user@' + instance.instancePublicIp });
+    new cdk.CfnOutput(this, 'Channel Backup Bucket', { value: channelBucket.bucketName });
   }
 }

package.json

@@ -14,17 +14,19 @@
     "@aws-cdk/assert": "1.120.0",
     "@types/jest": "^26.0.10",
     "@types/node": "10.17.27",
+    "aws-cdk": "1.120.0",
     "jest": "^26.4.2",
     "ts-jest": "^26.2.0",
-    "aws-cdk": "1.120.0",
     "ts-node": "^9.0.0",
     "typescript": "~3.9.7"
   },
   "dependencies": {
+    "@aws-cdk/aws-ec2": "1.120.0",
+    "@aws-cdk/aws-s3": "1.120.0",
+    "@aws-cdk/aws-s3-assets": "1.120.0",
+    "@aws-cdk/aws-ssm": "1.120.0",
     "@aws-cdk/core": "1.120.0",
-    "source-map-support": "^0.5.16",
-    "@aws-cdk/aws-ec2": "^1.120.0",
-    "@aws-cdk/aws-s3-assets": "^1.120.0",
-    "cdk-ec2-key-pair": "^2.2.1"
+    "cdk-ec2-key-pair": "^2.2.1",
+    "source-map-support": "^0.5.16"
   }
 }