Override --max-connections configuration

[akandratovich]

Expected behavior

For some time, there was an option to configure some properties for Docker. You could place file at path ~/Library/Containers/com.docker.docker/Data/database/com.docker.driver.amd64-linux/slirp/max-connections to override max connections.

Actual behavior

Currently, seems it's not working anymore. First, there is no such folder after some update. My docker containers start to drop connections at about 2000. The same configuration I can found for vpnkit from command line.

andrew           11782   0.0  0.1  4394256  16776   ??  S    11:58AM   0:00.46 com.docker.vpnkit --ethernet fd:3 --port fd:4 --introspection fd:5 --diagnostics fd:6 --vsock-path /Users/andrew/Library/Containers/com.docker.docker/Data/connect --host-names docker.for.mac.localhost,docker.for.mac.host.internal --gateway-names docker.for.mac.gateway.internal,docker.for.mac.http.internal --listen-backlog 32 --mtu 1500 --allowed-bind-addresses 0.0.0.0 --http /Users/andrew/Library/Group Containers/group.com.docker/http_proxy.json --dhcp /Users/andrew/Library/Group Containers/group.com.docker/dhcp.json --port-max-idle-time 300 --max-connections 2000 --gateway-ip 192.168.65.1 --host-ip 192.168.65.2 --lowest-ip 192.168.65.3 --highest-ip 192.168.65.254 --log-destination asl

I could not find the way to override it. Where is new database location? Does command line flags have more priority? How to override vpnkit launch flags?

Information

Docker for Mac: version: 17.12.0-ce-mac49 (d1778b704353fa5b79142a2055a2c11c8b48a653)
macOS: version 10.13.3 (build: 17D47)
logs: /tmp/C6F63F2B-3E7B-432B-AC93-83FF0C3424CD/20180215-120659.tar.gz
[OK]     db.git
[OK]     vmnetd
[OK]     dns
[OK]     driver.amd64-linux
[OK]     virtualization VT-X
[OK]     app
[OK]     moby
[OK]     system
[OK]     moby-syslog
[OK]     kubernetes
[OK]     env
[OK]     virtualization kern.hv_support
[OK]     slirp
[OK]     osxfs
[OK]     moby-console
[OK]     logs
[OK]     docker-cli
[OK]     menubar
[OK]     disk

[pgayvallet]

Hi.

We are not using the DB anymore.

You can still change the setting, though, by adding/editing the vpnKitMaxConnections property in the ~/Library/Group\ Containers/group.com.docker/settings.json file and restarting the app. This will override the default (2000) value for the --max-connections flag.

[docker-robott]

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