Notes on running a personal Mastodon instance

mastodon-notes.md

Personal Mastodon instance

Effective total cost: $3–5/mo

Setup

Decide on an EC2 instance type:

1. At AWS Console → EC2 → Instance Types, filter for ≥1 GB RAM and sort by price.
   • t4g.micro is lowest.
2. Look up what t4g.micro means:
   • t: general-purpose with a burstable CPU quota
   • 4: the current generation
   • g: ARM architecture
   • micro: the second lowest configuration
3. Calculate cost:
   • $6.15/mo when paying hourly
   • $3.59mo when paying annually
   • $2.31/mo when paying every 3 years

Prepare your AWS account:

• Set up an alarm for your estimated monthly bill so you're notified early of any unanticipated expenses.
• Import your SSH public key. (EC2 → us-west-2 → Key pairs)

Have ready:

• a domain name and DNS host
• an outgoing mail server
  • I use AWS SES since it's easy (decent reputation, automatic DKIM, etc.) and inexpensive ($0.01/mo), but any SMTP provider will do, and you could also set up a traditional mail server on the EC2 instance.
• static file storage/hosting
  • I use AWS S3 ($1/mo), but a variety of providers offer "S3-compatible" service, and you could also just use the filesystem on the EC2 instance.

Start an EC2 instance:

1. Launch an instance (EC2 → us-west-2 → Instances) with:
   • Name: Mastodon
   • Image: Ubuntu Server 22.04 LTS (HVM), SSD Volume Type (64-bit ARM)
   • Type: t4g.micro
   • Auto-assign public IP: Disable
   • Security Group:
     • Name: Mastodon
     • SSH from anywhere
     • HTTP from anywhere
     • HTTPS from anywhere
   • Storage: 8 GiB standard (HDD, $0.40/mo)
   • Termination protection: Enable
   • Credit specification: Standard
2. At EC2 → us-west-2 → Elastic IPs, allocate and associate a static IP address.
3. Publish an A record at your preferred DNS host.

Prepare the host:

1. SSH in as ubuntu.
2. Add 1 GB of swap:
   1. Make a swap file at /swapfile.
   2. Add a swap entry in /etc/fstab.
3. Add swap on compressed RAM:
   1. Install package systemd-zram-generator.
   2. Set zram-fraction = 1 and compression-algorithm = zstd in /etc/systemd/zram-generator.conf.
4. Configure unattended upgrades:
   1. Enable Automatic-Reboot in /etc/apt/apt.conf.d/50unattended-upgrades.
5. Update and upgrade packages.
6. Reboot.

Install Mastodon:

1. Follow Mastodon's instructions.
   • To tune PostgreSQL, set:
     • effective_cache_size = 256MB
   • Tune Node.js to use enough memory:
     • Set export NODE_OPTIONS='--max-old-space-size=1024' in ~mastodon/.bashrc.
   • When editing .env.production, pay particular attention to:
     • LOCAL_DOMAIN
     • SINGLE_USER_MODE
     • SMTP…
     • S3… and AWS…
   • When registering services, set:
     • mastodon-sidekiq: --concurrency 1
     • mastodon-web: MAX_THREADS=2 and WEB_CONCURRENCY=1
2. Schedule the recommended periodic cleanup tasks.
   • Set --concurrency 1 on both tasks.
3. Reboot.
4. Sign in to the web interface and review/configure admin settings.

Try out the setup for a few days/weeks, then commit to a longer payment term:

1. At EC2 → Reserved Instances → Purchase, filter for t4g.micro, sort by effective rate, and purchase a reservation.
2. Wait a few hours for payment processing to complete.
3. At EC2 → Reserved Instances, confirm that the reservation is active.

You should really consider looking into EC2 Spot instances... it's a real easy way to have bigger instances on the cheap for the common folk, instead of actually buying reserved EC2 instances that will probably not make much sense to someone if they stop using mastodon later and don't have any use to the reservation.

My t3.small instance runs almost half as cheap as a t3.micro on-demand instance (the "regular" priced instances). Here's a shot of the pricing graph for it, the price varies but more common instances like T or M almost always have a good, 50%+ discount over on-demand instances.
https://mast.pceninja.com/web/@punch/109328433145245539

i think the oracle offering with free vm 4core/24G mem would be ideal...

Very helpful, thank you! The only things I had to do differently were:

• setup certbot before symlinking the mastodon nginx configuration. mastodon/documentation#940
• All requests were 404ing until I ran chmod +x /home/mastodon

The latter sounds like mastodon/mastodon#18257. The instructions still specify Ubuntu 20.04 LTS so perhaps they need to be updated for 22.04 LTS.

Thanks everybody; it would be great if those of you who aren't using oracle's free tier are about to come back in a few months with some details on egress and s3 use (the uncertain parts of billing).

Thanks everybody; it would be great if those of you who aren't using oracle's free tier are about to come back in a few months with some details on egress and s3 use (the uncertain parts of billing).

I actually moved on to a cheap european VPS provider (due to smtp port opening issues) & used backblaze b2 (S3 compat.) free 10G trial; it filled up in a week :( . And I'm the only user. Admittedly I have subscribed to relays.

Very helpful, thank you! The only things I had to do differently were:

* setup certbot before symlinking the mastodon nginx configuration. [mastodon/documentation#940](https://github.com/mastodon/documentation/issues/940)

* All requests were 404ing until I ran `chmod +x /home/mastodon`

yes precisely. on both debian 10/11 & ubuntu 20.04 uand 22.04. I think even the official instructions are a bit off.

Thanks everybody; it would be great if those of you who aren't using oracle's free tier are about to come back in a few months with some details on egress and s3 use (the uncertain parts of billing).

I will report back later, but the results seem promising. And as for email, since the emails are only sent back to ME, I'm using SES and I didn't bother leaving the sandbox mode. Works pretty well.

Hello, how's everybody getting on — expenses reasonable?

AWS has announced an approximate doubling of the price, making small-scale usage like this untenable for the foreseeable future.

I haven’t yet gotten a straight answer to whether they’re planning to apply the new pricing model to the three years I committed to under different terms.