dhcpcd-discuss

On 10/11/2020 02:04, msg board wrote:
> I have a virtual interface vlan190 on my lxc container. When my container boots, 
> this interface only get ipv6 address. The dhcpcd daemon is start by init 
> environment using command dhcpcd . The expectation is that it will reach 
> /etc/dhcpcd.conf file which is where I specify the interface to configure. Here 
> is my dhcpcd.conf file (do read last few lines) . In Spite of this, I do not get 
> IPv4 IP on my vlan190 .
>
> When I run "dhcpcd --waitip 4 vlan190 on command line, I get IPv4 IP 
> immediately. However I cannot specify vlan190 on my init scripts for dhcpcd. It 
> has to go inside dhcpcd.conf. Is that a way to specify virtual interface in 
> dhcpcd.conf.
>
> # A sample configuration for dhcpcd.
> # See dhcpcd.conf(5) for details.
>
> # Allow users of this group to interact with dhcpcd via the control socket.
> #controlgroup wheel
>
> # Inform the DHCP server of our hostname for DDNS.
> hostname
>
> # Use the hardware address of the interface for the Client ID.
> #clientid
> # or
> # Use the same DUID + IAID as set in DHCPv6 for DHCPv4 ClientID as per RFC4361.
> # Some non-RFC compliant DHCP servers do not reply with this set.
> # In this case, comment out duid and enable clientid above.
> duid
>
> # Persist interface configuration when dhcpcd exits.
> persistent
>
> # Rapid commit support.
> # Safe to enable by default because it requires the equivalent option set
> # on the server to actually work.
> option rapid_commit
>
> # A list of options to request from the DHCP server.
> option domain_name_servers, domain_name, domain_search, host_name
> option classless_static_routes
> # Respect the network MTU. This is applied to DHCP routes.
> option interface_mtu
>
> # Most distributions have NTP support.
> #option ntp_servers
>
> # A ServerID is required by RFC2131.
> require dhcp_server_identifier
>
> # Generate SLAAC address using the Hardware Address of the interface
> #slaac hwaddr
> # OR generate Stable Private IPv6 Addresses based from the DUID
> slaac private
>
> interface vlan190
> waitip 4

Your configuration looks fine and should work.
But this all depends how exactly your init script starts dhcpcd.
If you add this to /etc/dhcpcd.conf at the top

debug
logfile /var/log/dhcpcd.log

Then hopefully the logfile will give a clue as to why it's not working.

Roy