The logs in Xcode Server (Server 3) by default point to /Library/Server/XcodeLogs/credserver.log. This takes all of the output from xcscredd and xcscredhandler. If you’re doing a lot of debugging then logs can be pointed to another location, such as another drive. The path to the logs is defined in the /Applications/Server.app/Contents/ServerRoot/System/Library/LogConfiguration directory. The file to edit is a standard property list, XCSCredentialServer.plist:
<?xml version=”1.0″ encoding=”UTF-8″?>
<!DOCTYPE plist PUBLIC “-//Apple//DTD PLIST 1.0//EN” “http://www.apple.com/DTDs/PropertyList-1.0.dtd”>
<plist version=”1.0″>
<dict>
<key>claimedFacilities</key>
<array>
<string>servermgrd</string>
<string>servermgr-listener</string>
<string>servermgr-notify</string>
</array>
<key>claimedSenders</key>
<array>
<string>servermgrd</string>
<string>servermgr-listener</string>
<string>servermgr-notify</string>
</array>
<key>logMaximumLevel</key>
<string>debug</string>
<key>logPath</key>
<string>/Library/Server/Logs/servermgrd.log</string>
</dict>
</plist>
Once open, look for a key called logPath. Change that to the desired path, such as /Volumes/MyDrive/Logs/credserver.log and then restart the service:
serveradmin stop xcode; serveradmin start xcode