


How to Establish an SSH Connection to a Private Instance via a Bastion Host Using Go's x/crypto/ssh?
Dec 09, 2024 pm 06:47 PMEstablishing SSH Connection to Private Instance Over Bastion Node with Go's x/crypto/ssh
Scenario Overview
In a VPC with public and private subnets, a "bastion" instance resides in the public subnet, providing access to the private "service instance" in the private subnet.
Connecting via Go's x/crypto/ssh
To connect to the service instance via Go's x/crypto/ssh, follow these steps:
-
Establish Bastion Connection:
bClient, err := ssh.Dial("tcp", bastionAddr, config) if err != nil { log.Fatal(err) }
Copy after login -
Dial Connection to Service Instance:
conn, err := bClient.Dial("tcp", serviceAddr) if err != nil { log.Fatal(err) }
Copy after login -
Create Virtual SSH Connection:
ncc, chans, reqs, err := ssh.NewClientConn(conn, serviceAddr, config) if err != nil { log.Fatal(err) }
Copy after login -
Instantiate SSH Client for Service Host:
sClient := ssh.NewClient(ncc, chans, reqs)
Copy after login -
Use SSH Client to Execute Commands and Upload Files
sClient can now be used for various SSH operations, such as running ls -l or transferring files.
Alternative to nc Command
The x/crypto/ssh library provides the Dial method, which allows for establishing a connection to the service host from the bastion host without using the nc command.
The above is the detailed content of How to Establish an SSH Connection to a Private Instance via a Bastion Host Using Go's x/crypto/ssh?. For more information, please follow other related articles on the PHP Chinese website!

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