Hey all,
I'm starting upgrades to old production servers to newer 64-bit Linux that
runs systemd >= v195.
Serial consoles are always my 1st step. Before upgrade it worked great.
After upgrade, with the new systemd-based config, I'm not having much luck
so far.
I configured the grub conf:
serial --unit=0 --speed=57600 --word=8 --parity=no --stop=1
terminal --timeout=3 serial console
title PRODUCTION
root (hd0,0)
kernel /vmlinuz root=/dev/sd1a noresume showopts x11failsafe vga=0x31a
console=tty0 console=com1,vga
initrd /initrd
I installed the getty service on S0:
cat /etc/systemd/system/getty.target.wants/serial-getty@ttyS0.service
[Unit]
Description=Serial Getty on %I
Documentation=systemd-getty-generator
BindsTo=dev-%i.device
After=dev-%i.device systemd-user-sessions.service
Before=getty.target
IgnoreOnIsolate=yes
[Service]
ExecStart=-/sbin/agetty -s %I 57600 vt102
Type=idle
Restart=always
RestartSec=0
UtmpIdentifier=%I
TTYPath=/dev/%I
TTYReset=yes
TTYVHangup=yes
KillMode=process
IgnoreSIGPIPE=no
KillSignal=SIGHUP
[Install]
WantedBy=getty.target
After a system boot the service is up:
systemctl status serial-getty@ttyS0.service
serial-getty@ttyS0.service - Serial Getty on ttyS0
Loaded: loaded (/etc/systemd/system/serial-getty@.service;
enabled)
Active: active (running) since Wed, 2013-07-10 10:55:13 PDT;
16min ago
Docs: man:agetty(8)
man:systemd-getty-generator(8)
Main PID: 1043 (agetty)
CGroup: name=systemd:/system/serial-getty@.service/ttyS0
└ 1043 /sbin/agetty -s ttyS0 57600 vt102
Jul 10 10:55:13 rosencrantz.lan systemd[1]: Starting Serial Getty on
ttyS0...
Jul 10 10:55:13 rosencrantz.lan systemd[1]: Started Serial Getty on ttyS0.
ps ax | grep S0
1043 ttyS0 Ss+ 0:00 /sbin/agetty -s ttyS0 57600 vt102
dmesg looks like the serial port is active:
dmesg | egrep -i "S0|serial|console|tty" | egrep -vi "usb"
[ 0.000000] Command line: root=/dev/sd1a noresume showopts
x11failsafe vga=0x31a console=tty0 console=com1,vga
[ 0.000000] Kernel command line: root=/dev/sd1a noresume showopts
x11failsafe vga=0x31a console=tty0 console=com1,vga
[ 0.000000] console [tty0] enabled
[ 0.218685] ACPI: (supports S0 S1 S3 S4 S5)
[ 1.228895] Console: switching to colour frame buffer device 160x64
[ 1.318499] Serial: 8250/16550 driver, 32 ports, IRQ sharing disabled
[ 1.339563] 00:07: ttyS0 at I/O 0x3f8 (irq = 4) is a 16550A
[ 21.032996] systemd[1]: Expecting device dev-ttyS0.device...
[ 21.739832] systemd[1]: Starting Dispatch Password Requests to
Console Directory Watch.
[ 21.775883] systemd[1]: Started Dispatch Password Requests to
Console Directory Watch.
[ 24.305690] systemd[1]: Starting Setup Virtual Console...
[ 25.384797] systemd[1]: Started Setup Virtual Console.
[ 26.942274] systemd[1]: Found device /dev/ttyS0.
[ 32.493821] Console: switching to colour dummy device 80x25
[ 32.691960] Console: switching to colour frame buffer device 240x67
[ 41.849014] systemd[1]: Starting Console System Startup Logging...
[ 42.550658] systemd[1]: Started Console System Startup Logging.
With that setup I get nothing out the serial port. I probably have the
grub cmd line wrong for using with systemd. I could use some help getting
this untangled.
Dave
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