ssh to VM fails after creating for lab 1.1

haral

ssh in browser window starts with status:

Connecting...
Establishing connection to SSH server...
You can drastically improve your key transfer times by migrating to OS Login.

but it eventually fails with error:

Connection Failed
We are unable to connect to the VM on port 22. Learn more about possible causes of this issue.

The VM was created as per the course lab instructions.
Why is ssh failing?!

chrispokorni

Hi @haral,

There are a few reasons why the connection to your GCE instance fails from the cloud console - a firewall rule blocking port 22, or sshd not ready. You can explore the google cloud documentation to help you to troubleshoot and possibly resolve the issue.

Regards,
-Chris

haral

haral@cloudshell:~$ netstat -pan | grep 22
(Not all processes could be identified, non-owned process info
will not be shown, you would have to be root to see it all.)
tcp 0 0 0.0.0.0:22 0.0.0.0:* LISTEN -

haral

haral@cloudshell:~$ sudo iptables -L
Chain INPUT (policy ACCEPT)
target prot opt source destination

Chain FORWARD (policy ACCEPT)
target prot opt source destination
DOCKER-USER all -- anywhere anywhere
DOCKER-ISOLATION-STAGE-1 all -- anywhere anywhere
ACCEPT all -- anywhere anywhere ctstate RELATED,ESTABLISHED
DOCKER all -- anywhere anywhere
ACCEPT all -- anywhere anywhere
ACCEPT all -- anywhere anywhere

Chain OUTPUT (policy ACCEPT)
target prot opt source destination

chrispokorni

Hi @haral,

Can you validate that the ssh daemon is listening on port 22? The output is missing that information. sudo would also help.

Is your GCE VPC firewall allowing all ingress? If not, is there a firewall rule allowing ingress to port 22?

Regards,
-Chris

haral

haral@cloudshell:~$ netstat -pan | grep 22
(Not all processes could be identified, non-owned process info
will not be shown, you would have to be root to see it all.)
tcp 0 0 0.0.0.0:22 0.0.0.0:* LISTEN -

haral

I gave up on GCP and attempting to run on local Ubuntu VM. In lab 3.2 LXC, the command "lxc-create -t download -n unpriv-cont-user" fails with:
aral@ubuntu:~$ lxc-create -t download -n unpriv-cont-user
lxc-create: unpriv-cont-user: conf.c: lxc_map_ids: 2878 newuidmap failed to write mapping "newuidmap: uid range [0-1) -> [231072-231073) not allowed": newuidmap 3149 0 231072 1 1000 1000 1
lxc-create: unpriv-cont-user: conf.c: userns_exec_mapped_root: 4646 Error setting up {g,u}id mappings for child process "3149"
lxc-create: unpriv-cont-user: tools/lxc_create.c: main: 319 Failed to create container unpriv-cont-user
haral@ubuntu:~$

The contents of the default.conf file are:
aral@ubuntu:~$ cat ~/.config/lxc/default.conf
lxc.net.0.type = veth
lxc.net.0.link = lxcbr0
lxc.net.0.flags = up
lxc.net.0.hwaddr = 00:16:3e:xx:xx:xx
lxc.idmap = u 0 231072 65536
lxc.idmap = g 0 231072 65536

I saw another help request and tried the suggested command but that also failed:
haral@ubuntu:~$ sudo lxc-create -t download -n unpriv-cont-user -- -d ubuntu -r xenial -a amd64
Setting up the GPG keyring
ERROR: Unable to fetch GPG key from keyserver
lxc-create: unpriv-cont-user: lxccontainer.c: create_run_template: 1616 Failed to create container from template
lxc-create: unpriv-cont-user: tools/lxc_create.c: main: 319 Failed to create container unpriv-cont-user
haral@ubuntu:~$

chrispokorni

Hi @haral,

Running sudo netstat, as suggested earlier, may have produced a more detailed output.

Subsequently, are you populating the ~/.config/lxc/default.conf file with lxc.idmap values extracted from the /etc/subuid and /etc/subgid files?

On local Ubuntu guest VMs, you may also need to set read-write permissions on the default.conf file, with the following command:

chmod 664 ~/.config/lxc/default.conf

Regards,
-Chris

haral

sudo netstat may have given some more output but you can see that sshd is running and listening on port 22 just from running netstat as a regular user...

I am following the commands exactly as shown, however the contents of the /etc/subuid and /etc/subgid files are different - they only have one entry:
haral@ubuntu:~$ ls -l .config/lxc/default.conf
-rw-r--r-- 1 haral haral 162 Sep 8 01:00 .config/lxc/default.conf
haral@ubuntu:~$ chmod 664 !$
chmod 664 .config/lxc/default.conf
haral@ubuntu:~$ cat !$
cat .config/lxc/default.conf
lxc.net.0.type = veth
lxc.net.0.link = lxcbr0
lxc.net.0.flags = up
lxc.net.0.hwaddr = 00:16:3e:xx:xx:xx
lxc.idmap = u 0 231072 65536
lxc.idmap = g 0 231072 65536
haral@ubuntu:~$ cat /etc/subuid
haral:100000:65536
haral@ubuntu:~$ cat /etc/subgid
haral:100000:65536
udo lxc-create -t download -n unpriv-cont-user -- -d ubuntu -r xenial -a amd64
[sudo] password for haral:
Setting up the GPG keyring
ERROR: Unable to fetch GPG key from keyserver
lxc-create: unpriv-cont-user: lxccontainer.c: create_run_template: 1616 Failed to create container from template
lxc-create: unpriv-cont-user: tools/lxc_create.c: main: 319 Failed to create container unpriv-cont-user
haral@ubuntu:~$

haral

The uid was incorrect in my previous post. Here is the correct output:
haral@ubuntu:~$ cat /etc/subuid
haral:100000:65536
haral@ubuntu:~$ cat /etc/subgid
haral:100000:65536
haral@ubuntu:~$ cat /etc/lxc/lxc-usernet

USERNAME TYPE BRIDGE COUNT

haral veth lxcbr0 10
haral@ubuntu:~$ cat ~/.config/lxc/default.conf
lxc.net.0.type = veth
lxc.net.0.link = lxcbr0
lxc.net.0.flags = up
lxc.net.0.hwaddr = 00:16:3e:xx:xx:xx
lxc.idmap = u 0 100000 65536
lxc.idmap = g 0 100000 65536
haral@ubuntu:~$ id
uid=1000(haral) gid=1000(haral) groups=1000(haral),4(adm),24(cdrom),27(sudo),30(dip),46(plugdev),116(lpadmin),126(sambashare)
haral@ubuntu:~$ sudo lxc-create -t download -n unpriv-cont-user -- -d ubuntu -r xenial -a amd64
Setting up the GPG keyring
ERROR: Unable to fetch GPG key from keyserver
lxc-create: unpriv-cont-user: lxccontainer.c: create_run_template: 1617 Failed to create container from template
lxc-create: unpriv-cont-user: tools/lxc_create.c: main: 327 Failed to create container unpriv-cont-user
haral@ubuntu:~$ lxc-create -t download -n unpriv-cont-user
lxc-create: unpriv-cont-user: tools/lxc_create.c: main: 327 Failed to create container unpriv-cont-user

chrispokorni

Hi @haral,

The updated content of the default.conf file is correct now.

Regards,
-Chris

haral

But, it still fails...

haral

The keyserver command allowed me to continue...