Error: truffle migrate

[pengyu]

I got the following error. Could you please show me how to fix the problem?

/tmp/x$ truffle init
Downloading...
Unpacking...
Setting up...
Unbox successful. Sweet!

Commands:

  Compile:        truffle compile
  Migrate:        truffle migrate
  Test contracts: truffle test
/tmp/x$ truffle compile
Compiling ./contracts/Migrations.sol...
Writing artifacts to ./build/contracts

/tmp/x$ truffle migrate

Error: No network specified. Cannot determine current network.
    at Object.detect (/Users/pengy/.nvm/versions/node/v9.9.0/lib/node_modules/truffle/build/webpack:/~/truffle-core/lib/environment.js:31:1)
    at /Users/pengy/.nvm/versions/node/v9.9.0/lib/node_modules/truffle/build/webpack:/~/truffle-core/lib/commands/migrate.js:91:1
    at finished (/Users/pengy/.nvm/versions/node/v9.9.0/lib/node_modules/truffle/build/webpack:/~/truffle-core/~/truffle-workflow-compile/index.js:53:1)
    at /Users/pengy/.nvm/versions/node/v9.9.0/lib/node_modules/truffle/build/webpack:/~/truffle-core/~/truffle-compile/index.js:313:1
    at /Users/pengy/.nvm/versions/node/v9.9.0/lib/node_modules/truffle/build/webpack:/~/truffle-core/~/truffle-compile/profiler.js:158:1
    at /Users/pengy/.nvm/versions/node/v9.9.0/lib/node_modules/truffle/build/webpack:/~/truffle-core/~/truffle-compile/~/async/dist/async.js:3874:1
    at /Users/pengy/.nvm/versions/node/v9.9.0/lib/node_modules/truffle/build/webpack:/~/truffle-core/~/truffle-compile/~/async/dist/async.js:473:1
    at replenish (/Users/pengy/.nvm/versions/node/v9.9.0/lib/node_modules/truffle/build/webpack:/~/truffle-core/~/truffle-compile/~/async/dist/async.js:993:1)
    at iterateeCallback (/Users/pengy/.nvm/versions/node/v9.9.0/lib/node_modules/truffle/build/webpack:/~/truffle-core/~/truffle-compile/~/async/dist/async.js:983:1)
    at /Users/pengy/.nvm/versions/node/v9.9.0/lib/node_modules/truffle/build/webpack:/~/truffle-core/~/truffle-compile/~/async/dist/async.js:958:1
    at /Users/pengy/.nvm/versions/node/v9.9.0/lib/node_modules/truffle/build/webpack:/~/truffle-core/~/truffle-compile/~/async/dist/async.js:3871:1
    at /Users/pengy/.nvm/versions/node/v9.9.0/lib/node_modules/truffle/build/webpack:/~/truffle-core/~/truffle-compile/profiler.js:154:1
    at /Users/pengy/.nvm/versions/node/v9.9.0/lib/node_modules/truffle/build/webpack:/~/truffle-core/~/truffle-compile/~/async/dist/async.js:1126:1
    at /Users/pengy/.nvm/versions/node/v9.9.0/lib/node_modules/truffle/build/webpack:/~/truffle-core/~/truffle-compile/~/async/dist/async.js:473:1
    at iteratorCallback (/Users/pengy/.nvm/versions/node/v9.9.0/lib/node_modules/truffle/build/webpack:/~/truffle-core/~/truffle-compile/~/async/dist/async.js:1050:1)
    at /Users/pengy/.nvm/versions/node/v9.9.0/lib/node_modules/truffle/build/webpack:/~/truffle-core/~/truffle-compile/~/async/dist/async.js:958:1
    at /Users/pengy/.nvm/versions/node/v9.9.0/lib/node_modules/truffle/build/webpack:/~/truffle-core/~/truffle-compile/~/async/dist/async.js:1123:1
    at /Users/pengy/.nvm/versions/node/v9.9.0/lib/node_modules/truffle/build/webpack:/~/truffle-core/~/truffle-compile/profiler.js:133:1
    at FSReqWrap.oncomplete (fs.js:171:5)

[GuillaumeCz]

Have you got a ganache instance running ?

[hskang9]

@pengyu, Even if you have ganache instance running, you need configure truffle.js to specify network to deploy(localhost/testnet/ethereum network). You can look up the documentation here.