Lxd: Fail to use sudo inside a container

[dann1]

lxc info

• Distribution: Ubuntu
• Distribution version: 16.04
• The output of "lxc info" or if that fails:
  config:
  core.https_address: 0.0.0.0:8443
  core.trust_password: true
  apiextensions:
  
  
  
  • id_map
    
    apistatus: stable
    
    apiversion: "1.0"
    
    auth: trusted
    
    public: false
    
    environment:
    
    addresses:
  
  
  • 10.8.9.130:8443
    
    architectures:
  
  
  • x86_64
  
  
  • i686
    
    driver: lxc
    
    driverversion: 2.0.3
    
    kernel: Linux
    
    kernelarchitecture: x86_64
    
    kernelversion: 4.4.0-31-generic
    
    server: lxd
    
    serverpid: 9342
    
    serverversion: 2.0.9
    
    storage: dir
    
    storageversion: ""
  
  

Issue description

I get a message _sudo: no tty present and no askpass program specified_ when executing a command with sudo inside a container. In the online demo this works OK.

Steps to reproduce

lxc exec container bash
su - ubuntu
sudo apt update
sudo: no tty present and no askpass program specified

[dann1]

Also I added a new user (team) and when trying swapping users with su I get another message

root@lxdone:~# su - ubuntu
ubuntu@lxdone:~$ su - team
su: must be run from a terminal

Note that neither _su_ nor _sudo_ fail when using them as root

[brauner]

Yeah, this is a classical problem that LXD itself can not really do something about. In short, sudo and su should be fixed to handle pty devices from different namespaces. Without going into detail and repeating it all: it's basically another variant of https://github.com/lxc/lxd/issues/936 and https://github.com/lxc/lxd/issues/1724 .

[dann1]

Ok thanks, I thought I had done something wrong generating the image

[dann1]

Hello again, if you enter sudo with argument -S, say, sudo -S apt update it gets the job done

[dann1]

Also this works for su