| #!/bin/bash |
| # |
| # Copyright 2012 Google Inc. |
| # |
| # Licensed under the Apache License, Version 2.0 (the "License"); |
| # you may not use this file except in compliance with the License. |
| # You may obtain a copy of the License at |
| # |
| # http://www.apache.org/licenses/LICENSE-2.0 |
| # |
| # Unless required by applicable law or agreed to in writing, software |
| # distributed under the License is distributed on an "AS IS" BASIS, |
| # WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| # See the License for the specific language governing permissions and |
| # limitations under the License. |
| # |
| # Makes linux enable fast reuse of sockets in TIME-WAIT state. We need this for |
| # load testing so that we don't run out of connection table slots and fail to |
| # get a socket. This isn't generally a good idea to set on public-facing |
| # servers because of trouble with NATs, but is fine here. |
| # |
| # This scripts prompts you for your su password if TIME-WAIT recycling isn't |
| # already enabled. |
| |
| set -e # exit script if any command returns an error |
| set -u # exit the script if any variable is uninitialized |
| |
| recycle_file=/proc/sys/net/ipv4/tcp_tw_recycle |
| if [ $(cat $recycle_file) -ne 1 ]; then |
| echo "Putting a '1' in proc/sys/net/ipv4/tcp_tw_recycle to avoid" |
| echo "running out of port numbers (due to old ones being in TIME_WAIT state)." |
| echo 1 >/tmp/1 |
| sudo cp /tmp/1 $recycle_file |
| rm /tmp/1 |
| fi |
