Errors and solutions for installing remix-ide on CentOS

remix-ide installation document: https://github.com/ethereum/remix-ide

Native environment:

> lsb_release -a
LSB Version::core-4.1-amd64:core-4.1-noarch
Distributor ID:	CentOS
Description:	CentOS Linux release 7.4.1708(Core)
Release:7.4.1708
Codename:	Core

> node --version
v8.9.3> npm --version
6.1.0

installation

> npm install remix-ide -g

start up

> remix-ide

Then an error..., the error message is as follows:

Error: Cannot find module './build/Release/scrypt'
 at Function.Module._resolveFilename(module.js:536:15)
 at Function.Module._load(module.js:466:25)
 at Module.require(module.js:579:17)
 at require(internal/module.js:11:18)
 at Object.<anonymous>(/services/apps/node-v8.9.3-linux-x64/lib/node_modules/remix-ide/node_modules/scrypt/index.js:3:20)
 at Module._compile(module.js:635:30)
 at Object.Module._extensions..js(module.js:646:10)
 at Module.load(module.js:554:32)
 at tryModuleLoad(module.js:497:12)
 at Function.Module._load(module.js:489:3)
 at Module.require(module.js:579:17)
 at require(internal/module.js:11:18)
 at Object.<anonymous>(/services/apps/node-v8.9.3-linux-x64/lib/node_modules/remix-ide/node_modules/scrypt.js/node.js:1:76)
 at Module._compile(module.js:635:30)
 at Object.Module._extensions..js(module.js:646:10)
 at Module.load(module.js:554:32)
 at tryModuleLoad(module.js:497:12)
 at Function.Module._load(module.js:489:3)
 at Module.require(module.js:579:17)
 at require(internal/module.js:11:18)
 at Object.<anonymous>(/services/apps/node-v8.9.3-linux-x64/lib/node_modules/remix-ide/node_modules/web3-eth-accounts/src/index.js:35:16)
 at Module._compile(module.js:635:30)

Look at the exception information, it should be the lack of scrypt package, check the system node_modules directory

ll /services/apps/node-v8.9.3-linux-x64/lib/node_modules/

There is indeed no scrypt

Then install scrpt

scrpt document https://www.npmjs.com/package/scrypt

Specific implementation steps:

> npm install -g node-gyp
> npm install -g scrypt

When installing node-gyp, another error was reported: WARN EACCES user “root” does not have permission to access the dev dir

Solution: https://github.com/nodejs/node-gyp/issues/454

The specific solution is to add the --unsafe-perm parameter during installation

npm install --unsafe-perm --verbose -g node-gyp

After installing scrypt, executing remix-ide still reported an error, continue to explore, and finally found a solution

https://github.com/barrysteyn/node-scrypt/issues/108

Specific implementation

cd /services/apps/node-v8.9.3-linux-x64/lib/node_modules/scrypt
node-gyp configure build

Compiled successfully

Finally, execute remix-ide, perfect, successful start

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