Add playbook and docs on Set-min-gas-price

README.md

@@ -1,5 +1,6 @@
 ## DevOps scripts
 
-1. [Setup blockchain backup from a node](./docs/Blockchain-backup.md)
+1. [Setup blockchain backup on a node](./docs/Blockchain-backup.md)
 2. [Make a spec.json hard-fork](./docs/Spec-hardfork.md)
 3. [Update scripts for validator nodes](./docs/Update-scripts-validator.md)
+4. [Set min_gas_price for validator nodes](./docs/Set-min-gas-price.md)

docs/Set-min-gas-price.md

@@ -0,0 +1,59 @@
+## Update scripts on validator nodes
+
+**ONLY FOR VALIDATOR NODES**
+
+0. this guide assumes that you're running this playbook from the same machine you used to make initial deployment of your node. So that you already have `python` and `ansible` installed, and you have the correct ssh keypair to root-access the node.
+
+1. clone this repository if you haven't done so before
+```
+git clone https://github.com/poanetwork/poa-devops.git
+cd poa-devops
+```
+or pull the latest changes
+```
+cd poa-devops
+git pull origin master
+```
+
+2. create/edit `hosts` file:
+```
+echo "" > hosts
+```
+and put your node's ip address (assuming it's 192.0.2.1) there with the following header:
+```
+[set-min-gas-price]
+192.0.2.1
+```
+**NOTE**: if you're updating an existing file, make sure you remove other tags `[...]` and ips.
+
+4. run the playbook:
+```
+ansible-playbook -i hosts set-min-gas-price.yml
+```
+
+5. connect to the node
+```
+ssh root@192.0.2.1
+```
+switch to the home folder:
+```
+cd /home/validator
+```
+and check the update time of `node.toml` file (should be about the time you started the playbook)
+```
+ls -lh
+# a long list should appear here, look for node.toml in the rightmost column and check the date and time on the same row
+```
+then check that line was actually added to the file:
+```
+grep min_gas_price node.toml
+```
+should return a **single** line:
+```
+min_gas_price = 1000000000
+```
+also check that backup was created:
+```
+ls -lh backups-node.toml/
+# look for a file named similar to node.toml-20180202-184912 Numbers represent date and time in UTC when the playbook was started
+```

roles/set-min-gas-price/tasks/main.yml

@@ -0,0 +1,19 @@
+---
+- name: Create directory for backups
+  file: path={{ home }}/backups-node.toml state=directory
+
+- name: Backup existing version
+  command: cp -a {{ home }}/node.toml {{ home }}/backups-node.toml/node.toml-{{ date }}
+
+- name: Add min_gas_price to node.toml
+  lineinfile:
+    path: "{{ home }}/node.toml"
+    insertafter: '^\[mining\]'
+    line: "min_gas_price = 1000000000"
+    state: present
+
+- name: Restart poa-parity service
+  service: name=poa-parity state=restarted enabled=yes
+
+- name: Restart poa-netstats service
+  service: name=poa-netstats state=restarted enabled=yes

set-min-gas-price.yml

@@ -0,0 +1,9 @@
+- hosts: set-min-gas-price
+  vars:
+    poa_role: validator
+    username: validator
+    date: "{{ lookup('pipe', 'date -u +%Y%m%d-%H%M%S') }}"
+    home: "/home/{{ poa_role }}"
+  user: root
+  roles:
+    - set-min-gas-price