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If the box you are running in is a VM, the VM host is already providing hardware redundancy. It’s not full redundancy but in practice it’s sufficient for dog ph

If the box you are running in is a VM, the VM host is already providing hardware redundancy. It’s not full redundancy but in practice it’s sufficient for dog photo sharing sites.

judge2020 4y ago
As far as I know only Google Cloud does ‘hardware redundancy’[0]. I’ve had single-instance outages in AWS and they don’t seem to really care if something goes wrong with your instance, although maybe they have more maintenance events than they let on and they might happen transparently to the user thanks to some form of live migration. 0: https://cloud.google.com/compute/docs/instances/live-migration https://cloud.google.com/compute/docs/instances/live-migrati...
- jeremyjh 4y ago
  I’m not talking about live migration - the instance will go down and there will be a brief outage while the instance restarts on another hypervisor. The same is true of a single dyno Heroku app.
  - electroly 4y ago
    For AWS, nothing involved there is automatic; you have to stop it* and then restart it. It will just stay broken until you restart it yourself. "Brief outage" suggests it might be automatic but in AWS it's not. * Possibly multiple times. Instances on degraded hosts have a tendency to get stuck and you have to stop, and then stop again to force stop it, and then sometimes even that doesn't work and you have to just wait. Source: have received lots of "EC2 Instance Retirement" emails
    - mnd999 4y ago
      This is what autoscaling groups are for, right? If set the autoscaler to keep one instance running it will spin another one when they retire the one you’re using.
      - dijit 4y ago
        “Weeks of reading AWS documentation will save you hours of learning about infrastructure” the topic is here is ease of use. Comparing Heroku to VMs and correctly configured ASGs is fine for me as a sysadmin, but they’re not targeting the same simplicity.
      - electroly 4y ago
        Yep, and if you know enough to set that up, you probably don't need Dokku.
        tekknik 4y ago
        An ASG isn’t nearly as difficult as setting up, securing, and running dokku. There’s even examples and such for setting up the ASG. If you get stuck, all accounts have free support and stack overflow is a few clicks away. The idea that one needs to switch to dokku to avoid setting up ASGs is just silly.
        electroly 4y ago
        My suggestion was the opposite: don't use Dokku, because you probably don't need it if you're capable of dinking around with AWS.
    - znep 4y ago
      Not any more. https://aws.amazon.com/about-aws/whats-new/2022/03/amazon-ec2-default-automatic-recovery/ https://aws.amazon.com/about-aws/whats-new/2022/03/amazon-ec... In theory. But yes, sometimes detaching resources can take a long time on a degraded host.

If the box you are running in is a VM, the VM host is already providing hardware redundancy. It’s not full redundancy but in practice it’s sufficient for dog photo sharing sites.

judge2020 4y ago

As far as I know only Google Cloud does ‘hardware redundancy’[0]. I’ve had single-instance outages in AWS and they don’t seem to really care if something goes wrong with your instance, although maybe they have more maintenance events than they let on and they might happen transparently to the user thanks to some form of live migration. 0: https://cloud.google.com/compute/docs/instances/live-migration https://cloud.google.com/compute/docs/instances/live-migrati...

jeremyjh 4y ago
I’m not talking about live migration - the instance will go down and there will be a brief outage while the instance restarts on another hypervisor. The same is true of a single dyno Heroku app.
- electroly 4y ago
  For AWS, nothing involved there is automatic; you have to stop it* and then restart it. It will just stay broken until you restart it yourself. "Brief outage" suggests it might be automatic but in AWS it's not. * Possibly multiple times. Instances on degraded hosts have a tendency to get stuck and you have to stop, and then stop again to force stop it, and then sometimes even that doesn't work and you have to just wait. Source: have received lots of "EC2 Instance Retirement" emails
  - mnd999 4y ago
    This is what autoscaling groups are for, right? If set the autoscaler to keep one instance running it will spin another one when they retire the one you’re using.
    - dijit 4y ago
      “Weeks of reading AWS documentation will save you hours of learning about infrastructure” the topic is here is ease of use. Comparing Heroku to VMs and correctly configured ASGs is fine for me as a sysadmin, but they’re not targeting the same simplicity.
    - electroly 4y ago
      Yep, and if you know enough to set that up, you probably don't need Dokku.
      - tekknik 4y ago
        An ASG isn’t nearly as difficult as setting up, securing, and running dokku. There’s even examples and such for setting up the ASG. If you get stuck, all accounts have free support and stack overflow is a few clicks away. The idea that one needs to switch to dokku to avoid setting up ASGs is just silly.
        electroly 4y ago
        My suggestion was the opposite: don't use Dokku, because you probably don't need it if you're capable of dinking around with AWS.
  - znep 4y ago
    Not any more. https://aws.amazon.com/about-aws/whats-new/2022/03/amazon-ec2-default-automatic-recovery/ https://aws.amazon.com/about-aws/whats-new/2022/03/amazon-ec... In theory. But yes, sometimes detaching resources can take a long time on a degraded host.