linux:boot
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linux:boot [2017/01/18 17:24] frank created |
linux:boot [2018/04/20 15:36] (current) frank |
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| + | ====== Boot ====== | ||
| + | |||
| === Grub === | === Grub === | ||
| - | * Grub 2 - Setting default entry | + | * Grub 2 - Setting default entry <code bash> |
| - | <code> | + | |
| Open /etc/default/grub and ensure this line exists: | Open /etc/default/grub and ensure this line exists: | ||
| GRUB_DEFAULT=saved | GRUB_DEFAULT=saved | ||
| Line 19: | Line 20: | ||
| </code> | </code> | ||
| - | === Systemd === | + | grubby |
| - | * Enable rc-local in OL7 | + | |
| <code> | <code> | ||
| + | # grubby --default-kernel | ||
| + | # grubby --set-default=/boot/vmlinuz-3.10.0-514.el7.x86_64 | ||
| + | </code> | ||
| + | === Systemd === | ||
| + | * Enable rc-local in OL7<code bash> | ||
| cat >> /usr/lib/systemd/system/rc-local.service <<EOF | cat >> /usr/lib/systemd/system/rc-local.service <<EOF | ||
| Line 35: | Line 40: | ||
| </code> | </code> | ||
| + | === Initramfs === | ||
| + | <code> | ||
| + | # extract initramfs in RHEL7/Centos7 | ||
| + | /usr/lib/dracut/skipcpio initramfs-3.10.0-229.el7.x86_64.img | zcat | cpio -idv | ||
| + | </code> | ||
| + | |||
| + | === Debug === | ||
| + | <code> | ||
| + | kernel cmd line: debug initcall_debug systemd.log_target=console systemd.journald.forward_to_console=1 | ||
| + | serial console in grub: | ||
| + | serial --unit=0 --speed=115200 | ||
| + | terminal --timeout=10 console serial | ||
| + | kernel cmd line: console=tty1 console=ttyS0,115200n8 | ||
| + | </code> | ||
linux/boot.1484789078.txt.gz · Last modified: 2017/01/18 17:24 by frank
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