我正在为 ubuntu 创建云图像，试图弄清楚它在云中运行时如何将所有信息写入串行控制台。
我用的是这个图片： https://cloud-images.ubuntu.com/xenial/current/xenial-server-cloudimg-amd64-disk1.img
当我尝试在我的图像上重新创建该行为时，它会在 journald 启动后停止写入
[ 11.192345] systemd[1]: Starting Create list of required static device nodes for the current kernel...
[ 11.362003] systemd[1]: Mounted RPC Pipe File System.
[ 11.461612] systemd[1]: Mounted POSIX Message Queue File System.
[ 11.555519] systemd[1]: Mounted Huge Pages File System.
[ 11.649353] systemd[1]: Mounted Debug File System.
[ 11.743620] systemd[1]: Started Journal Service.
^[[r^[[H^[[2J
Ubuntu 16.04.1 LTS euca-10-254-38-28 ttyS0
euca-10-254-38-28 login: Ubuntu 16.04.1 LTS euca-10-254-38-28 ttyS0
我想要类似这样的东西：
[ 3.469429] systemd[1]: Started Nameserver information manager.
[^[[0;32m OK ^[[0m] Started Nameserver information manager.
[ 3.475530] iscsi: registered transport (tcp)
[ 3.492282] systemd[1]: Started Journal Service.
[^[[0;32m OK ^[[0m] Started Journal Service.
[ 3.511329] iscsi: registered transport (iser)
[^[[0;32m OK ^[[0m] Started LVM2 metadata daemon.
Starting Create Static Device Nodes in /dev...
Starting Load/Save Random Seed...
Starting Flush Journal to Persistent Storage...
Starting udev Coldplug all Devices...
[^[[0;32m OK ^[[0m] Started Set console keymap.
[^[[0;32m OK ^[[0m] Started Load Kernel Modules.
[^[[0;32m OK ^[[0m] Started Load/Save Random Seed.
[^[[0;32m OK ^[[0m] Started Create Static Device Nodes in /dev.
我在 grub 中添加了“console=tty0 console=ttyS0”。我以为这在 /etc/systemd/journald.conf 中已经更改，但那里的一切都还是默认的。
答案1
我认为一旦systemd启动，它会将输出发送到journal而不是tty。在 中/etc/systemd/system.conf，尝试设置DefaultStandardOutput=为journal+console或tty。重新启动以进行测试。
man systemd.directives您可以通过从 开始并查找指令来获取任何 systemd 指令的文档。