Am 05.07.2017 um 17:29 schrieb Ian Pilcher:
I am using CentOS 7 (systemd 219) on a Banana Pi as my residential
firewall/gateway. The Banana Pi does not have a persistent clock, so
it has no idea what the time is until it is able to sync via NTP. Thus,
the initial DHCP leases that the BPi receives have incorrect expiration/
renewal times (since the system can't sync via NTP before it has an IP
address - chicken and egg).
My first attempt to address this was to add a drop-in to
chrony-wait.service that bounces the WAN interface.
Unfortunately, the expected dhclient processes are not running, so the
addresses are never renewed. I suspect that systemd may be killing
them, because chrony-wait is a oneshot service.
Can anyone suggest a way to achieve this?
by just doing the dhcpd stuff on your own, do what ever you need
"oneshot" in ExecStartPre/ExecStartPost and put the dchclient into
ExecStart of a Type=forking unit
s[root@srv-rhsoft:~]$ systemctl status network-wan-bridge.service
? network-wan-bridge.service - Network Internet Bridge
Loaded: loaded (/etc/systemd/system/network-wan-bridge.service;
enabled; vendor preset: disabled)
Active: active (running) since Di 2017-07-04 08:47:33 CEST; 1 day 8h ago
Main PID: 8182 (dhclient)
Tasks: 1 (limit: 512)
CGroup: /system.slice/network-wan-bridge.service
??8182 /usr/sbin/dhclient -4 -H srv-rhsoft -q
--request-options subnet-mask,broadcast-address,routers,interface-mtu br-wan
Warning: Journal has been rotated since unit was started. Log output is
incomplete or unavailable.
[root@srv-rhsoft:~]$ cat /etc/systemd/system/network-wan-bridge.service
[Unit]
Description=Network Internet Bridge
After=network.service systemd-networkd.service network-online.target
[Service]
Type=forking
ExecStartPre=-/usr/sbin/brctl addbr br-wan
ExecStartPre=-/usr/sbin/brctl stp br-wan off
ExecStartPre=-/usr/sbin/brctl setageing br-wan 600
ExecStartPre=-/usr/sbin/brctl setfd br-wan 5
ExecStartPre=-/usr/sbin/brctl addif br-wan wan
ExecStartPre=-/usr/sbin/brctl addif br-wan vmnet1
ExecStartPre=-/usr/sbin/ifconfig br-wan hw ether 00:50:8D:B5:CC:DE up
ExecStart=/usr/sbin/dhclient -4 -H srv-rhsoft -q --request-options
subnet-mask,broadcast-address,routers,interface-mtu br-wan
ExecStartPost=-/usr/sbin/ifconfig br-wan -multicast -allmulti
ExecStartPost=-/usr/sbin/ifconfig vmnet1 0.0.0.0 -multicast -allmulti up
ExecStopPost=-/usr/sbin/ifconfig br-wan down
ExecStopPost=-/usr/sbin/brctl delbr br-wan
Restart=always
RestartSec=1
PrivateTmp=yes
NoNewPrivileges=yes
CapabilityBoundingSet=CAP_NET_ADMIN CAP_NET_BIND_SERVICE
CAP_NET_BROADCAST CAP_NET_RAW
SystemCallFilter=~acct modify_ldt add_key adjtimex clock_adjtime
delete_module fanotify_init finit_module get_mempolicy init_module
io_destroy io_getevents iopl ioperm io_setup io_submit io_cancel kcmp
kexec_load keyctl lookup_dcookie mbind migrate_pages mount move_pages
open_by_handle_at perf_event_open pivot_root process_vm_readv
process_vm_writev ptrace remap_file_pages request_key set_mempolicy
swapoff swapon umount2 uselib vmsplice
ReadOnlyDirectories=/etc
ReadOnlyDirectories=/usr
InaccessibleDirectories=-/mnt
InaccessibleDirectories=-/mnt/data
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