How to setup ejfat nodes

1. Install BOOST with:

   sudo apt-get install lib boost-all-dev

2. Install ZMQ with:

   sudo apt install libzmq3-dev

3. For ERSAP install protobuf:

   sudo apt install libprotobuf-dev protobuf-compiler

4. For pip (python installer for python) install:

   sudo apt install pip

5. For prometheus:
   1. installation:

      sudo apt install prometheus

      sudo apt install prometheus-node-exporter

   2. python client libraries:

      pip install prometheus-client

      pip install prometheus-api-client

   3. exporter start up:

      sudo systemctl start prometheus-node-exporter

      sudo systemctl enable prometheus-node-exporter

6. For increased UDP buffer & queue sizes:
   1. For the long term write the following lines into the sysctl.conf file:

      net.core.rmem_max=25000000

      net.core.wmem_max=25000000

      net.core.netdev_max_backlog=65536

   2. To make it immediately effective, execute:

      sudo sysctl -w net.core.rmem_max=25000000

      sudo sysctl -w net.core.wmem_max=25000000

      sudo sysctl -w net.core.netdev_max_backlog=65536

      ifconfig <ifname> txqueuelen 10000

7. To mount /daqfs:
   1. sudo mkdir /daqfs
   2. edit /etc/fstab to include the line:

      dubhe:/raid/daqfs          nfs     rw,bg           0       0

   3. sudo apt-get install nfs-common
   4. sudo mount /daqfs
8. To change one's home directory to /daqfs/home/myUserName:
   1. Edit the /etc/passwd file to include a line something like:

      myUserName:x:2101:1208:John Doe,,,:/daqfs/home/myUserName:/bin/bash

      where 2101 is user id and 1208 is epsci group. Hint: set your user id and group ids on the ejfat nodes to be the same as it is on the computer center machines or there will be an issue when you access files served by computer center like /daqfs/home or /group/...
9. When sending UDP packets:

Take advantage of the ejfat nodes' NICs which have a max MTU of 9978

sudo ifconfig enp193s0f1np1 mtu 9978