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Vitaly Zdanevich
Vitaly Zdanevich

Reputation: 14852

Google Cloud ssh timeout: how to increase session time?

For connection from Linux I use:

gcloud compute --project "xxx" ssh --zone "europe-west-b" "yyy"

After ~10 minutes of innactivity my console freeze or I see error 255.

Upvotes: 18

Views: 28889

Answers (2)

Felipe Pereira
Felipe Pereira

Reputation: 1444

It freezes because of KEEP_ALIVE. In Linux systems it's not started automatically.

You should run that command in the linux client or in the compute engine instance:

sudo /sbin/sysctl -w net.ipv4.tcp_keepalive_time=60 net.ipv4.tcp_keepalive_intvl=60 net.ipv4.tcp_keepalive_probes=5

For MAC OS client: 

sudo sysctl -w net.inet.tcp.always_keepalive=1 net.inet.tcp.keepidle=60000 net.inet.tcp.keepinit=60000 net.inet.tcp.keepintvl=60000

For Windows on the path:

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\Tcpip\Parameters\

Add these settings or change the values to:

KeepAliveInterval: 1000
KeepAliveTime: 60000
TcpMaxDataRetransmissions: 10

After that your client console will be able to keep a bigger session time !!!

Upvotes: 0

IBam
IBam

Reputation: 11844

Google cloud has a session timeout across the board of 10 minutes, so you need to use a keepalive. Try adding the argument --ssh-flag="-ServerAliveInterval=30" - any value less than 600 should do the trick there.

There's a description of the timeout here, and full usage details for gcloud ssh here.

Upvotes: 30

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