How create simple HelloWorld contract?

Question

I try example from book "Mastering EOS". I have written hello.cpp:

#include <eosio/eosio.hpp>    
using namespace eosio;

class [[eosio::contract]] hello: public contract {
public:
    using contract::contract;

    [[eosio::action]]
    void hi ( name user) {
        print ("Hello, ", user);
    }
};

(note: I changed eosy::action to eosio::action After compiling eosio-cpp hello.cpp are warnings:

Warning, empty ricardian clause file
Warning, empty ricardian clause file
Warning, action <hi> does not have a ricardian contract

and appear files: hello.wasm and hello.abi Next I try:

cleos create eosio account hello1 MY_PUBLC_KEY -p eosio@active

where paste key in place MY_PUBLC_KEY is error: OwnerKey is required Next I start nodeos and try

cleos set contract hello ~/CONTRACTS_DIR/hello1 -p hello.active

is error:

Publishing contract...
Failed to connect to nodeos at http://127.0.0.1:8888/; is nodeos running?

although nodeos is running.

Answer 1

Check whether nodeos was run with the option --plugin eosio::chain_api_plugin. This option can be put in config.ini like plugin = eosio::chain_api_plugin.