royki

CUE for DevOps

Overview

This is a tutorial that uses a toy infrastructure project to highlight some of CUE's features and show how it can be used to simplify and manage infrastructure. Go to Tutorial if you want to skip the introductory stuff.

What is CUE?

From cuelang.org:

royki

---
- name: Ejecutar Proceso con VAULT_TOKEN
  hosts: localhost  # Puedes ajustar los hosts según tu entorno
  gather_facts: false  # Desactivar recopilación de hechos

  vars:
    vault_address: "http://direccion-de-tu-vault:8200"  # Ajusta la dirección de tu Vault Server

  tasks:
    - name: Establecer VAULT_TOKEN como variable de entorno

royki

Keybase proof

I hereby claim:

• I am royki on github.
• I am royki (https://keybase.io/royki) on keybase.
• I have a public key ASCQVvh550YJ-MixnyhzbZGNT4PJBsDl_4zj71yrvlsxIgo

To claim this, I am signing this object:

royki

2023-07-04 19:16:36.788 TRACE tokio-runtime-worker gossip: Cleaned up 0 stale messages, 0 left (0 known) protocol=/cb78cf8b70f6db4099d9de03e2cdf98a56ef49fc04d22bd460a7b6bb598c4310/grandpa/1
2023-07-04 19:16:37.888 TRACE tokio-runtime-worker gossip: Cleaned up 0 stale messages, 0 left (0 known) protocol=/cb78cf8b70f6db4099d9de03e2cdf98a56ef49fc04d22bd460a7b6bb598c4310/grandpa/1
2023-07-04 19:16:38.079  INFO tokio-runtime-worker substrate: 💤 Idle (1 peers), best: #0 (0xcb78…4310), finalized #0 (0xcb78…4310), ⬇ 0 ⬆ 0    
2023-07-04 19:16:38.403 DEBUG tokio-runtime-worker sync: Propagating transactions    
2023-07-04 19:16:38.899 TRACE tokio-runtime-worker sub-libp2p: Ping time with PeerId("12D3KooWBzwDUvxn9X9Zz4E9SYgWoNYFwoMU6GRTJbD7E7tZYjpj"): 290.082µs    
2023-07-04 19:16:38.924 TRACE tokio-runtime-worker sub-libp2p: Ping time with PeerId("12D3KooWBzwDUvxn9X9Zz4E9SYgWoNYFwoMU6GRTJbD7E7tZYjpj"): 211.812µs    
2023-07-04 19:16:38.988 TRACE tokio-runtime-worker gossip: Cleaned up 0 stale messages, 0 left (0 know

royki

package_update: true
package_upgrade: true
groups:
  - docker
users:
  - name: ubuntu
    groups: docker
  - name: telegraf
    groups: docker
cloud_config_modules:

royki

blockscout_1  | 2022-08-12T14:53:30.577 [error] Task #PID<0.3980.361> started from Indexer.Block.Realtime.Fetcher terminating
blockscout_1  | ** (stop) exited in: GenServer.call(Indexer.Fetcher.InternalTransaction, {:buffer, [19426479]}, 10000)
blockscout_1  |     ** (EXIT) no process: the process is not alive or there's no process currently associated with the given name, possibly because its application isn't started
blockscout_1  |     (elixir 1.13.1) lib/gen_server.ex:1019: GenServer.call/3
blockscout_1  |     (indexer 0.1.0) lib/indexer/block/realtime/fetcher.ex:385: Indexer.Block.Realtime.Fetcher.async_import_remaining_block_data/2
blockscout_1  |     (indexer 0.1.0) lib/indexer/block/realtime/fetcher.ex:224: Indexer.Block.Realtime.Fetcher.import/2
blockscout_1  |     (indexer 0.1.0) lib/indexer/block/fetcher.ex:167: Indexer.Block.Fetcher.fetch_and_import_range/2
blockscout_1  |     (indexer 0.1.0) lib/indexer/block/realtime/fetcher.ex:293: Indexer.Block.Realtime.Fetcher.do_fetch_and_import_blo

royki

blockscout_1  | 
blockscout_1  | Options:
blockscout_1  | 
blockscout_1  | [conflict_target: [:block_hash, :block_index], on_conflict: #Ecto.Query<from i0 in Explorer.Chain.InternalTransaction, where: fragment("(EXCLUDED.transaction_hash, EXCLUDED.index, EXCLUDED.call_type, EXCLUDED.created_contract_address_hash, EXCLUDED.created_contract_code, EXCLUDED.error, EXCLUDED.from_address_hash, EXCLUDED.gas, EXCLUDED.gas_used, EXCLUDED.init, EXCLUDED.input, EXCLUDED.output, EXCLUDED.to_address_hash, EXCLUDED.trace_address, EXCLUDED.transaction_index, EXCLUDED.type, EXCLUDED.value) IS DISTINCT FROM (?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?)", i0.transaction_hash, i0.index, i0.call_type, i0.created_contract_address_hash, i0.created_contract_code, i0.error, i0.from_address_hash, i0.gas, i0.gas_used, i0.init, i0.input, i0.output, i0.to_address_hash, i0.trace_address, i0.transaction_index, i0.type, i0.value), update: [set: [block_number: fragment("EXCLUDED.block_number"), call_type: fragment("EXCLUDED.c

royki

1. In Windows - Edit registry key

• Computer\HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\Tcpip\Parameters
• Change following Value 0 to 1 IPEnableRouter

royki

- Consensus Algoriithm must have - 
  - Agreement -> Where every correct process must agree on the same value.
  - Validity -> The value agreed on must have been proposed by another process.
  - Termination -> A value will eventually be decided by every correct process.
- CAP Theorem -> An algorithm cannot provide more than of the three following properties -
  - Consistency
  - Availability
  - Partition Tolerance
- There are different types of failure that a consensus algorithm might have to deal with fail. 
  - Fail-stop

royki

• $$ is the process ID (PID) of the script itself.
• $! gives the process id of the most recently executed background process.
• $? Stores the exit value of the last command that was executed.
• $# is the special parameter in which bash gives the number of positional parameter in decimal.
• $@ Stores all the arguments that were entered on the command line, individually quoted ("$1" "$2" ...).
• $* Stores all the arguments that were entered on the command line ($1 $2 ...).
• $_ The underscore variable is set at shell startup and contains the absolute file name of the shell or script being executed as passed in the argument list.
• https://javarevisited.blogspot.com/2011/06/special-bash-parameters-in-script-linux.html
• https://devhints.io/bash
• https://www.tecmint.com/useful-tips-for-writing-bash-scripts-in-linux/