ssh

Avoid stuck after ‘SSH2_MSG_SERVICE_ACCEPT received’

It is becoming pretty slow in SSH to a CentOS server.

Trying to print a verbose log:

$ ssh -vvvv my-host
....
debug3: send packet: type 21
debug2: set_newkeys: mode 1
debug1: rekey out after 134217728 blocks
debug1: SSH2_MSG_NEWKEYS sent
debug1: expecting SSH2_MSG_NEWKEYS
debug3: receive packet: type 21
debug1: SSH2_MSG_NEWKEYS received
debug2: set_newkeys: mode 0
debug1: rekey in after 134217728 blocks
debug1: Will attempt key: /Users/user/.ssh/id_rsa RSA SHA256:XXXXX/gNY explicit
debug2: pubkey_prepare: done
debug3: send packet: type 5
debug3: receive packet: type 7
debug1: SSH2_MSG_EXT_INFO received
debug1: kex_input_ext_info: server-sig-algs=<rsa-sha2-256,rsa-sha2-512>
debug3: receive packet: type 6
debug2: service_accept: ssh-userauth
debug1: SSH2_MSG_SERVICE_ACCEPT received
debug3: send packet: type 50
..... <<<-- long long long silence here
debug3: receive packet: type 51 <<<-- and then continue to access the server
debug1: Authentications that can continue: publickey,gssapi-keyex,gssapi-with-mic,password
debug3: start over, passed a different list publickey,gssapi-keyex,gssapi-with-mic,password
debug3: preferred publickey,keyboard-interactive,password

(more…)

By Yu, ago

SSH port forwarding

SSH port forwarding is a mechanism in SSH for tunneling application ports from the client machine to the server machine, or vice versa.

Suppose we wish to visit a port in remote but behind the firewall, we can use SSH port forwarding to bind that port into local.

(more…)

By Yu, ago

如何rsync同步非标准SSH接口

一般情况下,我们用rsync可以很容易的同步一个远程目录.

$ rsync -avzh --progress --delete \
    name@remote_host:source_dir target_dir

这样就把远程的一个目录同步回来了.

但是现在问题来了,当 port 为非标准的 22 端口时, 我们应该怎样加参数呢?比如有时候我们会 NAT 到 2222 端口.

(more…)

By Yu, ago

properties的使用

1. 适用环境:

当前，在做ssh框架,国际化等各种Java项目的时候，常常需要使用到lo4j.properties,en_us.properties 之类,它们是怎么起作用的呢? 找了点资料，尝试了下,发现它装载配置的确挺简单的 (more…)

By Yu, ago