See the administration guide

  1. Create two copies of stellar-core.
    • In other words, you should have something like ~/stellar-core and ~/stellar-core-2 such that each of them is a copy of Stellar Core. In the following, we will assume that you have one copy in ~/stellar-core and another in ~/stellar-core-2.
  2. Install each by following the installation guide.
  3. Create ~/stellar-core/stellar-core.cfg with the following content:
    HTTP_PORT=8080
    PUBLIC_HTTP_PORT=false
    RUN_STANDALONE=false

    NETWORK_PASSPHRASE="My local network"

    PEER_PORT=11625

    # public key = GB6TNFAOGXLLEMXP5NZEN36O3XEEUPOIK55FAHHCZGOBFMDB2CB6FO4K
    NODE_SEED="SADB4NABNQ3BKTGX3LHDOR43LAKBIAGK5YQNDN5J2BTJDCRVL5VQTMZ5 self"
    NODE_IS_VALIDATOR=true

    DATABASE="sqlite3://stellar.db"

    COMMANDS=["ll?level=info"]
    ARTIFICIALLY_GENERATE_LOAD_FOR_TESTING=true

    FAILURE_SAFETY=0
    UNSAFE_QUORUM=true

    KNOWN_PEERS = ["127.0.0.1:11626"]

    [QUORUM_SET]
    THRESHOLD_PERCENT=100
    VALIDATORS=["$self", "GB6Y2KCSMXJIBRW4JQTTOY3IDXM5SOC5WK56HCID5RI2GLMBUTKASVEW"]

    [HISTORY.vs]
    get="cp /tmp/stellar-core/history/vs/{0} {1}"
    put="cp {0} /tmp/stellar-core/history/vs/{1}"
    mkdir="mkdir -p /tmp/stellar-core/history/vs/{0}"
  1. Create ~/stellar-core-2/stellar-core.cfg with the following content:
    HTTP_PORT=8088
    PUBLIC_HTTP_PORT=false
    RUN_STANDALONE=false

    NETWORK_PASSPHRASE="My local network"

    PEER_PORT=11626

    # public key : GB6Y2KCSMXJIBRW4JQTTOY3IDXM5SOC5WK56HCID5RI2GLMBUTKASVEW
    NODE_SEED="SA3YGQZVLVS7CAE33DBSEYPIURFC65THP66ZWJXXI66I2XCKAAXP3JBW self"
    NODE_IS_VALIDATOR=true

    DATABASE="sqlite3://stellar.db"

    COMMANDS=["ll?level=info"]
    ARTIFICIALLY_GENERATE_LOAD_FOR_TESTING=true

    FAILURE_SAFETY=0
    UNSAFE_QUORUM=true

    KNOWN_PEERS = ["127.0.0.1:11625"]

    [QUORUM_SET]
    THRESHOLD_PERCENT=100
    VALIDATORS=["$self", "GB6TNFAOGXLLEMXP5NZEN36O3XEEUPOIK55FAHHCZGOBFMDB2CB6FO4K"]

    [HISTORY.vs]
    get="cp /tmp/stellar-core/history-2/vs/{0} {1}"
    put="cp {0} /tmp/stellar-core/history-2/vs/{1}"
    mkdir="mkdir -p /tmp/stellar-core/history-2/vs/{0}"
  1. In both ~/stellar-core and ~/stellar-core-2, run stellar-core new-db; stellar-core force-scp; stellar-core run.
  2. If you see messages about closed ledgers like following, the two nodes are talking to each other! 
     2020-06-03T13:18:32.101 GB6Y2 [Ledger INFO] Got consensus: [seq=4, prev=f6b88d, txs=0, ops=0, sv: [ txH: c141b3, ct: 1591204712, upgrades: [ ] ]]
 2020-06-03T13:18:32.104 GB6Y2 [Ledger INFO] Closed ledger: [seq=4, hash=7da1db]
 2020-06-03T13:18:37.122 GB6Y2 [Herder INFO] Quorum information for 3 : {"agree":2,"delayed":0,"disagree":0,"fail_at":1,"hash":"d073ee","ledger":3,"missing":0,"phase":"EXTERNALIZE","validated":true}
 2020-06-03T13:18:37.123 GB6Y2 [Ledger INFO] Got consensus: [seq=5, prev=7da1db, txs=0, ops=0, sv: [ txH: 6d045f, ct: 1591204717, upgrades: [ ] ]]
 2020-06-03T13:18:37.128 GB6Y2 [Ledger INFO] Closed ledger: [seq=5, hash=520f75]