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Martin Hope
Server Fault
Asked: 2019-08-11 03:24:12 +0800 CST
  • 1

最近在具有 LTO-6 磁带驱动器的主机上从 14.04 升级到 18.04 显示该mt命令不再支持该compression参数。有人知道切换驱动器压缩的另一种方法吗？

# mt /dev/nst0 compression off                                                                                                                                                          
mt: invalid argument ‘/dev/nst0’ for ‘operation’
Valid arguments are:
  - ‘eof’, ‘weof’
  - ‘fsf’
  - ‘bsf’
  - ‘fsr’
  - ‘bsr’
  - ‘rewind’
  - ‘offline’, ‘rewoffl’, ‘eject’
  - ‘status’
  - ‘bsfm’
  - ‘eom’
  - ‘retension’
  - ‘erase’
  - ‘asf’
  - ‘fsfm’
  - ‘seek’
linux ubuntu
Martin Hope
Server Fault
Asked: 2019-08-07 11:51:04 +0800 CST
  • 1

我最近将主机从 Ubuntu 14.04 升级到 18.04，当我尝试ssh在 18.04 下使用时，我收到错误消息key_load_public: invalid format。

我在此主机（和远程）上使用的密钥对的公钥部分如下所示：

command="/root/bin/rsync_only" ssh-rsa AAAAB...kEzWH0cMQ== root@vargas

似乎如果我删除该command=部分，我不会收到invalid format错误消息。它多年来一直运行良好。有人知道为什么现在这是一个问题吗？

/root/bin/rsync_only

#!/bin/sh
case "$SSH_ORIGINAL_COMMAND" in
   *\&*)
            echo "Rejected"
   ;;

   *\;*)
            echo "Rejected"
   ;;

   rsync\ --server*)
            $SSH_ORIGINAL_COMMAND
   ;;

   *)
            echo "Rejected"
   ;;
esac

ssh -vvv

# ssh remote_host -i ~/.ssh/id_rsync -vvv
OpenSSH_7.6p1 Ubuntu-4ubuntu0.3, OpenSSL 1.0.2n  7 Dec 2017
debug1: Reading configuration data /root/.ssh/config
debug1: Reading configuration data /etc/ssh/ssh_config
debug1: /etc/ssh/ssh_config line 19: Applying options for *
debug2: resolving "remote_host" port 22
debug2: ssh_connect_direct: needpriv 0
debug1: Connecting to remote_host [10.10.16.1] port 22.
debug1: Connection established.
debug1: permanently_set_uid: 0/0
key_load_public: invalid format
...

来自 Ubuntu 14.04 的 ssh 和 -vvv 输出

ubuntu-14.04 # ssh remote_host -i ~/.ssh/id_rsync     
Rejected
Connection to remote_host closed.

ubuntu-14.04# ssh remote_host -i ~/.ssh/id_rsync -vvv
OpenSSH_6.6.1, OpenSSL 1.0.1f 6 Jan 2014
debug1: Reading configuration data /root/.ssh/config
debug1: Reading configuration data /etc/ssh/ssh_config
debug2: ssh_connect: needpriv 0
debug1: Connecting to remote_host [10.10.16.1] port 22.
debug1: Connection established.
debug1: permanently_set_uid: 0/0
debug3: Incorrect RSA1 identifier
debug3: Could not load "/root/.ssh/id_rsync" as a RSA1 public key
debug2: key_type_from_name: unknown key type 'command="/root/bin/rsync_only"'
debug3: key_read: missing keytype
...
linux ubuntu
Martin Hope
Server Fault
Asked: 2018-08-03 09:27:01 +0800 CST
  • 2

我继承了一个 postgres 数据库（我对此几乎没有经验）并试图找出一种方法来转储/备份它。我一直在阅读有关它的文档，并且可以将 DB 转储到单独的文件中，但想知道为什么我不能 dump template0. 据我了解，这是一种“默认”模板，如果修改，它似乎很重要。为什么这不起作用？

test# export PGPASSWORD="xxxxxxx"; for database in `psql --username=postgres --command='\list' -h localhost | grep '^ [a-zA-Z0-9]' | awk '{print $1};'`; do pg_dump -U postgres ${database} > ${database}.sql; done                    

pg_dump: [archiver (db)] connection to database "template0" failed: FATAL:  database "template0" is not currently accepting connections
backup postgresql