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roachprod: increase concurrent unauthenticated SSH connections #37001

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Apr 25, 2019
Merged

roachprod: increase concurrent unauthenticated SSH connections #37001

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8 changes: 8 additions & 0 deletions pkg/cmd/roachprod/vm/aws/support.go
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Original file line number Diff line number Diff line change
Expand Up @@ -87,6 +87,14 @@ echo -e "\nmakestep 0.1 3" | sudo tee -a /etc/chrony/chrony.conf
sudo /etc/init.d/chrony restart
sudo chronyc -a waitsync 30 0.01 | sudo tee -a /root/chrony.log

# sshguard can prevent frequent ssh connections to the same host. Disable it.
sudo service sshguard stop
# increase the number of concurrent unauthenticated connections to the sshd
# daemon. See https://en.wikibooks.org/wiki/OpenSSH/Cookbook/Load_Balancing.
# By default, only 10 unauthenticated connections are permitted before sshd
# starts randomly dropping connections.
sudo sh -c 'echo "MaxStartups 64:30:128" >> /etc/ssh/sshd_config'
sudo service sshd restart
# increase the default maximum number of open file descriptors for
# root and non-root users. Load generators running a lot of concurrent
# workers bump into this often.
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6 changes: 6 additions & 0 deletions pkg/cmd/roachprod/vm/gce/utils.go
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Expand Up @@ -77,6 +77,12 @@ fi
sudo chmod 777 /mnt/data1
# sshguard can prevent frequent ssh connections to the same host. Disable it.
sudo service sshguard stop
# increase the number of concurrent unauthenticated connections to the sshd
# daemon. See https://en.wikibooks.org/wiki/OpenSSH/Cookbook/Load_Balancing.
# By default, only 10 unauthenticated connections are permitted before sshd
# starts randomly dropping connections.
sudo sh -c 'echo "MaxStartups 64:30:128" >> /etc/ssh/sshd_config'
sudo service sshd restart
# increase the default maximum number of open file descriptors for
# root and non-root users. Load generators running a lot of concurrent
# workers bump into this often.
Expand Down