Microsoft provides instructions for installing PowerShell on Linux; these should be followed before attempting to configure remoting: https://docs.microsoft.com/en-us/powershell/scripting/install/installing-powershell-core-on-linux?view=powershell-6.

Once installed, it is possible to make PowerShell the default shell. This is optional and does not affect remoting. First, check that PowerShell is listed in the shells file:

Get-Content /etc/shells   # Use cat or less in Bash

The native chsh (change shell) command can be used to change the default shell for the current user, as shown in the following example:

chsh -s /usr/bin/pwsh

To configure remoting using WSMan, the OMI and PSRP packages must be installed. The following example uses yum since the operating system in use is CentOS 7:

yum install omi.x86_64 omi-psrp-server.x86_64

By default, CentOS has a firewall configured. The network interface in use, in this case eth0, must be added to an appropriate zone, and WinRM must be allowed:

firewall-cmd --zone=home --change-interface=eth0
firewall-cmd --zone=home --add-port=5986/tcp

Once configured, it should be possible to connect to the remote host. SSL is required to form the connection. The certificate is self-signed so certificate validity tests must be skipped at this stage:

$params = @{
    ComputerName   = 'LinuxSystemNameOrIPAddress'
    Credential     = Get-Credential 
    Authentication = 'Basic'
    UseSsl         = $true
    SessionOption  = New-PSSessionOption -SkipCACheck -SkipCNCheck
}
Enter-PSSession @params

The state of the certificate leaves the identity of the host in question, but it does ensure that traffic is encrypted. If SSL is to be used beyond testing, a valid certificate chain should be established.

At this point, the remote computer should be accessible using both Windows PowerShell and PowerShell Core.