We set up a connection to one remote app server, carrying a remote tunnel that connects back to an unused port on its jump server. Both jump servers lack the space for an interim copy of the data. A file is to be transferred from app-dev to app-qa. ![]() If I understand correctly, you have two jump servers (jump-qa and jump-dev) protecting two app servers (app-qa and app-dev) the jump servers can ssh to each other no box other than the relevant jump server can ssh to the corresponding app server. You can get rid of it by adding LogLevel Quiet to your bastion host config stanza. This is SSH tearing down the Prox圜ommand connection and is nothing to be alarmed about. When closing a Prox圜ommand connection, you will see the warning message "Killed by signal 1". Now let's check for the presence of the copied file on the QA Application Server. MacBook-Pro:~ barrychapman$ scp -3 devapplicationserver:/etc/hosts qaapplicationserver:/tmp/ Now let's copy a file from Dev Application server to QA Application via your workstation. Ls: cannot access /tmp/hosts: No such file or directory MacBook-Pro:~ barrychapman$ ssh qaapplicationserver ls /tmp/hosts Testing for presence of file on target server, it won't be there. Prox圜ommand ssh -i ~/.ssh/id_rsa -W %h:%p MacBook-Pro:~ barrychapman$ cat ~/.ssh/config Here is an ~/.ssh/config file that sets up the direct access from your workstation to the application servers via the appropriate jump (aka bastion server). ![]() Assumption is made that you have SSH public key authentication configured.We'll perform a test copy of a 670GB /etc/hosts file -).QA Application Server is named qaapplicationserver.Dev Application Server is named devapplicationserver.Note that this option disables the progress meter. Without this option the data is copied directly between the two remote hosts. scp -3 devappserver:/path/to/copy/from qaappserver:/path/to/copy/toįrom the scp man page: -3 Copies between two remote hosts are transferred through the local host. This syntax is intuitively clear, will be more readily supportable by Sys Admins that follow you and does not make useless use of cat. It allows you to recursively copy, rsync or what ever you'd like without the hassle of considering potentially complex pipes. Plus, this syntax actually works unlike some of the other suggestions. Copying across the network on the servers will go quickly, as it is a gigabit connection.īy far, the easiest way is to just copy it via scp. We do not have time to download the data and re-upload it. However, the problem that we cannot connect to the jump box from the application server.ĭo we have any options? This is getting to be a desperate situation, and time is of the essence. I did some research, and learned that we could potentially do a series of tunnels through these servers so that we can stream the data straight from one app server to the other via the tunnels. ![]() We have a lot of content (670 GB) on the DEVELOPMENT APPLICATION SERVER, and we need to get this to the QA APPLICATION SERVER.Ĭopying this data to the jump boxes is not an option because they lack the required amount of space. The jump boxes are on the same subnet, and CAN talk to each other.The application server cannot connect to either jump boxes.You MUST connect to the application server via the jump box.There are a few rules in place courtesy of the firewall: In order to connect to the application server, you must connect to the jump box first, and then SSH to the Application server. We have two main environments in question:
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