SSH reliability settings #317
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auto-merge was automatically disabled
August 5, 2024 17:25
Pull request was converted to draft
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SSH connections keep breaking between Hetzner EU DCs and AWS us-east-1 for no particular reason. Suspect Hetzner local network saturation and/or a function of trans-atlantic routing/peering/time of day. Adding connection multiplexing and keepalive to test this theory. change-type: patch
ab77
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Aug 19, 2024
| @@ -839,6 +846,10 @@ jobs: | |||
| aws ec2 wait instance-running --instance-ids "${instance_id}" | |||
| with_backoff aws ec2 wait instance-status-ok --instance-ids "${instance_id}" | |||
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| private_ip="$(aws ec2 describe-instances --instance-id "${instance_id}" \ | |||
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we may want to use this in the future
ab77
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Aug 19, 2024
| # https://forums.docker.com/t/docker-compose-through-ssh-failing-and-referring-to-docker-example-com/115165/18 | ||
| - path: /etc/ssh/sshd_config.d/00-cloud-init | ||
| content: | | ||
| MaxStartups 100:0:100 |
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this is the actual fix
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* enable SSHD multiplexing, KeepAlive and relax throttling Thank you for the hint: https://forums.docker.com/t/docker-compose-through-ssh-failing-and-referring-to-docker-example-com/115165/18?u=ab77 MaxStartups Specifies the maximum number of concurrent unauthenticated connections to the SSH daemon. Additional connections will be dropped until authentication succeeds or the LoginGraceTime expires for a connection. The default is 10:30:100. Alternatively, random early drop can be enabled by specifying the three colon separated values start:rate:full (e.g. "10:30:60"). sshd(8) will refuse connection attempts with a probability of rate/100 (30%) if there are currently start (10) unauthenticated connections. The probability increases linearly and all connection attempts are refused if the number of unauthenticated connections reaches full (60). change-type: patch
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klutchell
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Aug 19, 2024
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Thank you for the hint: