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More on node operation and configuration

Start Node

Run docker-compose up.

$ docker-compose up -d

The docker ps command shows the list of running docker containers.

$ docker ps
CONTAINER ID   IMAGE                                                          COMMAND                CREATED              STATUS                          PORTS                                                                 NAMES
0de99e33cdc9     iconloop/prep-node:1910261021xc97f33    "/src/entrypoint.sh"      2 minutes ago        Up 2 minutes(healthy)    0.0.0.0:7100->7100/tcp, 0.0.0.0:9000->9000/tcp prep_prep_1

Corresponding columns,

Column Description
CONTAINER ID Container ID
IMAGE P-Rep Node's image name
COMMAND The script will be executed whenever a P-Rep Node container is run
STATUS Healthcheck status. One of "starting" , "healthy", "unhealthy" or "none"
PORTS Exposed ports on the running container
NAMES Container name

You can read the container booting log from the log folder.

$ tail -f data/PREP-MainNet/log/booting_20190419.log
[2019-10-28 10:43:05.204] Your IP: xx.xx.xx.xx
[2019-10-28 10:43:05.209] RPC_PORT: 9000 / RPC_WORKER: 3
[2019-10-28 10:43:05.214] DEFAULT_PATH=/data/mainnet in Docker Container
[2019-10-28 10:43:05.219] DEFAULT_LOG_PATH=/data/mainnet/log
[2019-10-28 10:43:05.224] DEFAULT_STORAGE_PATH=/data/mainnet/.storage
[2019-10-28 10:43:05.229] scoreRootPath=/data/mainnet/.score_data/score
[2019-10-28 10:43:05.234] stateDbRootPath=/data/mainnet/.score_data/db
[2019-10-28 10:43:05.239] Time synchronization with NTP / NTP SERVER: time.google.com
[2019-10-28 10:43:12.022] P-REP package version info - _1910261021xc97f33
[2019-10-28 10:43:12.853] iconcommons             1.1.2
iconrpcserver           1.4.5
iconsdk                 1.2.0
iconservice             1.5.15
loopchain               2.4.16

Entrypoint.sh Diagram

Stop Node

$ docker-compose down

View Node Status

Check the current state and information of the prep-node

API Checks

The current state of a node can be confirmed by /api/v1/status/peer and /api/v1/avail/peer API functions. The response data are the same, but HTTP response codes are different.

$ curl localhost:9000/api/v1/status/peer

{
  "made_block_count": 0,
  "leader_made_block_count": 7,
  "status": "Service is online: 0",
  "state": "Watch",
  "service_available": true,
  "peer_type": "0",
  "audience_count": "0",
  "consensus": "siever",
  "peer_id": "hx72bff0f887ef183bde1391dc61375f096e75c74a",
  "block_height": 10106994,
  "round": 0,
  "epoch_height": 10106995,
  "unconfirmed_block_height": -1,
  "total_tx": 72003516,
  "unconfirmed_tx": 0,
  "peer_target": "xxx.xxx.xxx.xxx:7100",
  "leader_complaint": 1,
  "peer_count": 24,
  "leader": "hxc9e36a98a3fca0b636eb822ff5a96db658e4bb88",
  "epoch_leader": "hxc9e36a98a3fca0b636eb822ff5a96db658e4bb88",
  "versions": {
    "loopchain": "2.4.16",
    "iconservice": "1.5.15",
    "iconrpcserver": "1.4.5",
    "iconcommons": "1.1.2",
    "earlgrey": "0.0.4"
  },
  "mq": {
    "peer": {
      "message_count": 0
    },
    "channel": {
      "message_count": 0
    },
    "score": {
      "message_count": 0
    }
  }
}
  • /api/v1/avail/peer returns HTTP response 503 when the service is unavailable

This is useful when performing a health check based on the HTTP response code of the load balancer.

#Return HTTP 503 Service Unavailable 

state : InitComponents, EvaluateNetwork, BlockSync, SubscribeNetwork
  • /api/v1/status/peer returns 200 OK at BlockSync
$ curl -i localhost:9000/api/v1/status/peer
HTTP/1.1 200 OK
Connection: close
Access-Control-Allow-Origin: *
Content-Length: 573
Content-Type: application/json

{
  "made_block_count": 0,
  "leader_made_block_count": 7,
  "status": "Service is online: 0",
  "state": "Watch",
  "service_available": true,
  "peer_type": "0",
  "audience_count": "0",
  "consensus": "siever",
  "peer_id": "hx72bff0f887ef183bde1391dc61375f096e75c74a",
  "block_height": 10106994,
  "round": 0,
  "epoch_height": 10106995,
  "unconfirmed_block_height": -1,
  "total_tx": 72003516,
  "unconfirmed_tx": 0,
  "peer_target": "xxx.xxx.xxx.xxx:7100",
  "leader_complaint": 1,
  "peer_count": 24,
  "leader": "hxc9e36a98a3fca0b636eb822ff5a96db658e4bb88",
  "epoch_leader": "hxc9e36a98a3fca0b636eb822ff5a96db658e4bb88",
  "versions": {
    "loopchain": "2.4.16",
    "iconservice": "1.5.15",
    "iconrpcserver": "1.4.5",
    "iconcommons": "1.1.2",
    "earlgrey": "0.0.4"
  },
  "mq": {
    "peer": {
      "message_count": 0
    },
    "channel": {
      "message_count": 0
    },
    "score": {
      "message_count": 0
    }
  }
}
  • /api/v1/avail/peer returns 503 OK at BlockSync
$ curl -i localhost:9000/api/v1/avail/peer
HTTP/1.1 503 Service Unavailable
Connection: close
Access-Control-Allow-Origin: *
Content-Length: 573
Content-Type: application/json

{
  "made_block_count": 0,
  "leader_made_block_count": 7,
  "status": "Service is online: 0",
  "state": "Watch",
  "service_available": true,
  "peer_type": "0",
  "audience_count": "0",
  "consensus": "siever",
  "peer_id": "hx72bff0f887ef183bde1391dc61375f096e75c74a",
  "block_height": 10106994,
  "round": 0,
  "epoch_height": 10106995,
  "unconfirmed_block_height": -1,
  "total_tx": 72003516,
  "unconfirmed_tx": 0,
  "peer_target": "xxx.xxx.xxx.xxx:7100",
  "leader_complaint": 1,
  "peer_count": 24,
  "leader": "hxc9e36a98a3fca0b636eb822ff5a96db658e4bb88",
  "epoch_leader": "hxc9e36a98a3fca0b636eb822ff5a96db658e4bb88",
  "versions": {
    "loopchain": "2.4.16",
    "iconservice": "1.5.15",
    "iconrpcserver": "1.4.5",
    "iconcommons": "1.1.2",
    "earlgrey": "0.0.4"
  },
  "mq": {
    "peer": {
      "message_count": 0
    },
    "channel": {
      "message_count": 0
    },
    "score": {
      "message_count": 0
    }
  }
}

Node Status Detail

value name Description Reason or allowed value
made_block_count number of block generated by node Reset when node became a leader after a rotation or reorerated.
status service on / off status

"Service is online: 1" : Working (leader status)
"Service is online: 0" : Working (not a leader status)
"Service is offline: block height sync" : block sync condition
"Service is offline: mq down" ": channel mq issue
state node condition detailed information (display at bottom)
service_available service condition [ true / false ]
peer_type classify leader node and verifying node

"0" : verifying node
"1" : leader node
audience_count DEPRECATION, It will be remove
consensus consensus algorithm

"siever" : current consensus algorithm
"LFT" : consensus algorithm that will adapt in the future
peer_id unique address of node 40 digit HEX string
block_height Current block height of node
round number of counts for current block consensus process The count increases by one when leader node fails to process transaction and leader complaint is occured or consensus is failed. The count reset when block generation is complete
epoch_height block heights of processing block. In case of citizen nodes, their block heights stop at SubscribeNetwork block heights because they don’t participate in consensus.
unconfirmed_block_height block heights of unprocessed block same as epoch_height
total_tx Total number of tx until current block
unconfirmed_tx

number of unprocessed tx that hold by queue
if it holds by leader more than one minute leader complaint will occur
peer_target IP address and port of node "IP:PORT"
leader_complaint DEPRECATION, It will be remove
peer_count total number of nodes in blockchain network
leader Unique address of a leader node 40 digit HEX string
epoch_leader Unique address of a leader node in consensus process 40 digit HEX string
mq.peer.message_count Accumulated number of messages in pier MQ Presents ‘-1’ when an error occurs and details can be found in "error"
mq.channel.message_count Accumulated number of messages in channel MQ Presents ‘-1’ when an error occurs and details can be found in "error"
mq.score.message_count Accumulated number of messages in SCORE MQ Presents ‘-1’ when an error occurs and details can be found in "error"

State Detail

State Value Description
InitComponents Channel Service initial state
Consensus Loopchain Consensus begins. Convert to BlockHeightSync automatically
BlockHeightSync Block height Sync state begins. Convert to EvaluateNetwork automatically
EvaluateNetwork Evaluate the BlockSync state by checking the network status
BlockSync Block Sync loop.
SubscribeNetwork Determine the type depending on the node type. A citizen node requests the block generation message to a parent node.
Watch Citizen node default state. Relay transaction and sync the blocks created by a parent node
Vote Status of validating and voting blocks created by the leader
LeaderComplain Status of requesting leader complain for current leader and wait for complain
BlockGenerate Status of leader creating a block
GracefulShutdown End Process

Docker Environment Variables

version: '3'
services:
  icon2-node:
    image: 'iconloop/icon2-node'
    restart: "on-failure"
    container_name: "icon2-node"
    network_mode: "host"
    stdin_open: true
    environment:
      SERVICE: "MainNet"  # MainNet, SeJong
      #IS_AUTOGEN_CERT: "true"
      GOLOOP_LOG_LEVEL: "debug" # trace, debug, info, warn, error, fatal, panic
      KEY_STORE_FILENAME: "INPUT_YOUR_KEY_STORE_FILENAME" # e.g. keystore.json read a config/keystore.json
      KEY_PASSWORD: "INPUT_YOUR_KEY_PASSWORD" # e.g. "/goloop/config/keystore.json" read a "config/keystore.json" of host machine
      FASTEST_START: "true"    # It can be restored from latest Snapshot DB.
      ROLE: 3 # preps = 3, citizen = 0

    cap_add:
      - SYS_TIME

    volumes:
      - ./config:/goloop/config
      - ./data:/goloop/data
      - ./logs:/goloop/logs

The P-Rep Node image supports the following environment variables:

Environment variable Description Default value Allowed value
IPADDR Setting the IP address $EXT_IPADDR
LOCAL_TEST false false
NETWORK_ENV Network Environment name PREP-TestNet mainnet, PREP-TestNet
SERVICE Service Name default
SERVICE_API SERVICE_API URI https://${SERVICE}.net.solidwallet.io/api/v3 URI
ENDPOINT_URL ENDPOINT API URI https://${SERVICE}.net.solidwallet.io URI
NTP_SERVER NTP SERVER ADDRESS time.google.com
NTP_REFRESH_TIME NTP refresh time 21600
FIND_NEIGHBOR Find fastest neighborhood PRrep false
DEFAULT_PATH Setting the Default Root PATH /data/${NETWORK_ENV}
DEFAULT_LOG_PATH Setting the logging path ${DEFAULT_PATH}/log
DEFAULT_STORAGE_PATH block DB will be stored ${DEFAULT_PATH}/.storage
USE_NAT if you want to use NAT Network no
NETWORK_NAME
VIEW_CONFIG for check deployment state false boolean (true/false)
USE_MQ_ADMIN Enable RabbitMQ management Web interface.The management UI can be accessed using a Web browser at http://{node-hostname}:15672/ false boolean (true/false)
MQ_ADMIN RabbitMQ management username admin
MQ_PASSWORD RabbitMQ management password iamicon
LOOPCHAIN_LOG_LEVEL loopchain log level INFO DEBUG, INFO, WARNING, ERROR
ICON_LOG_LEVEL iconservice log level INFO DEBUG, INFO, WARNING, ERROR
LOG_OUTPUT_TYPE loopchain's output log type file file, console
outputType iconservice's output log type $LOG_OUTPUT_TYPE file, console
CONF_PATH Setting the configure file path /${APP_DIR}/conf
CERT_PATH Setting the certificate key file path /${APP_DIR}/cert
REDIRECT_PROTOCOL http http
SUBSCRIBE_USE_HTTPS false false
ICON_NID Setting the ICON Network ID number 0x50
ALLOW_MAKE_EMPTY_BLOCK false false
score_fee true true
score_audit false false
scoreRootPath ${DEFAULT_PATH}/.score_data/score ${DEFAULT_PATH}/.score_data/score
stateDbRootPath ${DEFAULT_PATH}/.score_data/db ${DEFAULT_PATH}/.score_data/db
iissDbRootPath ${DEFAULT_PATH}/.iissDb ${DEFAULT_PATH}/.iissDb
CHANNEL_BUILTIN boolean (true/false) true
PEER_NAME uname uname
PUBLIC_PATH public cert key location ${CERT_PATH}/${IPADDR}_public.der
PRIVATE_PATH private cert key location ${CERT_PATH}/${IPADDR}_private.der
PRIVATE_PASSWORD private cert key password test
LOAD_PEERS_FROM_IISS true true
CHANNEL_MANAGE_DATA_PATH ${CONF_PATH}/channel_manange_data.json ${CONF_PATH}/channel_manange_data.json
CONFIG_API_SERVER https://download.solidwallet.io https://download.solidwallet.io
GENESIS_DATA_PATH ${CONF_PATH}/genesis.json ${CONF_PATH}/genesis.json
BLOCK_VERSIONS
NEXT_BLOCK_VERSION_HEIGHT
FORCE_RUN_MODE Setting the loopchain running parameter e.g. if FORCE_RUN_MODE is
configure_json ${CONF_PATH}/configure.json ${CONF_PATH}/configure.json
iconservice_json ${CONF_PATH}/iconservice.json ${CONF_PATH}/iconservice.json
iconrpcserver_json ${CONF_PATH}/iconrpcserver.json ${CONF_PATH}/iconrpcserver.json
ICON_REVISION 4 4
ROLE_SWITCH_BLOCK_HEIGHT 1 1
mainPRepCount 22 22
mainAndSubPRepCount 100 100
decentralizeTrigger 0.002 0.002
RPC_PORT Choose a RPC service port 9000
RPC_WORKER Setting the number of RPC workers 3
RPC_GRACEFUL_TIMEOUT rpc graceful timeout 0
PRIVATE_KEY_FILENAME YOUR_KEYSTORE or YOUR_CERTKEY FILENAME FileName
PRIVATE_PASSWORD YOUR_KEY_PASSWORD String

Troubleshooting

Q: How to check if a container is running or not?

The docker ps command shows the list of running docker containers.

$ docker ps
CONTAINER ID   IMAGE                                                          COMMAND                CREATED              STATUS                          PORTS                                                                 NAMES
0de99e33cdc9     iconloop/prep-node:1910261021xc97f33    "/src/entrypoint.sh"      2 minutes ago        Up 2 minutes(healthy)    0.0.0.0:7100->7100/tcp, 0.0.0.0:9000->9000/tcp prep_prep_1

You should look under the STATUS field to see if the container is up and in healthy state.

Inside the container, there is a healthcheck script running with the following configuration. It will return unhealthy when it fails.

Healthcheck option value
retries 4
interval 30s
timeout 20s
start-period 60s

The container can have three states:

  • starting - container just starts
  • healthy - when the health check passes
  • unhealthy - when the health check fails

If the container does not start properly or went down unexpectedly, please check the booting.log. Below is the log messages on success.

$ cat data/PREP-MainNet/log/booting_${DATE}.log 

[2019-10-28 10:43:05.204] Your IP: xxx.xxx.xxx.xxx
[2019-10-28 10:43:05.209] RPC_PORT: 9000 / RPC_WORKER: 3
[2019-10-28 10:43:05.214] DEFAULT_PATH=/data/mainnet in Docker Container
[2019-10-28 10:43:05.219] DEFAULT_LOG_PATH=/data/mainnet/log
[2019-10-28 10:43:05.224] DEFAULT_STORAGE_PATH=/data/mainnet/.storage
[2019-10-28 10:43:05.229] scoreRootPath=/data/mainnet/.score_data/score
[2019-10-28 10:43:05.234] stateDbRootPath=/data/mainnet/.score_data/db
[2019-10-28 10:43:05.239] Time synchronization with NTP / NTP SERVER: time.google.com
[2019-10-28 10:43:12.022] P-REP package version info - _1910261021xc97f33
[2019-10-28 10:43:12.853] iconcommons             1.1.2
iconrpcserver           1.4.5
iconsdk                 1.2.0
iconservice             1.5.15
loopchain               2.4.16

Q: How to locate errors from logs?

Error log messages example

Grep the ERROR messages from the log files to find the possible cause of the failure.

$ cat data/PREP-MainNet/log/booting_${DATE}.log | grep ERROR

[2019-08-12 02:08:48.746] [ERROR] Download Failed - http://20.20.1.149:5000/cert/20.20.1.195_public.der status_code=000

[2019-08-12 01:58:46.439] [ERROR] Unauthorized IP address, Please contact our support team

Docker container generates these log files below

booting.log

  • The log file contains the errors that occurred when the docker container starts up.

iconrpcserver.log

  • The log file contains information about the request/response message handling going through the iconrpcserver.

iconservice.log

  • The log file contains the internals of ICON Service

loopchain.channel-txcreator-icon_dex_broadcast.icon_dex.log

  • The log file contains information about TX broadcast from a node to other nodes

loopchain.channel-txcreator.icon_dex.log

  • The log file contains information about the process of confirming TXƒ

loopchain.channel-txreceiver.icon_dex.log

  • The log file contains information about receiving the broadcasted TX from a node.

loopchain.channel.icon_dex.log

  • The log file contains information about internals of loopchain engine

Q: How to monitor different resources?

We recommend the following tools for resource monitoring

  1. Network monitoring - iftop, nethogs, vnstat
  2. CPU/Memory monitoring - top, htop
  3. Disk I/O monitoring - iostat, iotop
  4. Docker monitoring - docker stats, ctop