氾濫原

Ubuntu LTS 16 → 18 → 20

tech | 23:50 |

一応バックアップ

sudo parted -l
Model: Virtio Block Device (virtblk)
Disk /dev/vda: 107GB
Sector size (logical/physical): 512B/512B                                                                                                                                                                                                                                     Partition Table: gpt
Disk Flags:

Number  Start   End     Size    File system     Name              Flags                                                                                                                                                                                                        1      1049kB  51.5GB  51.5GB  ext4            Linux filesystem
 2      51.5GB  53.7GB  2145MB  linux-swap(v1)  Linux swap
 3      53.7GB  107GB   53.7GB  ext4            Linux filesystem


Filesystem     Type      Size  Used Avail Use% Mounted on
udev           devtmpfs  982M     0  982M   0% /dev
tmpfs          tmpfs     200M   24M  177M  12% /run
/dev/vda1      ext4       48G   18G   28G  40% /
tmpfs          tmpfs    1000M     0 1000M   0% /dev/shm
tmpfs          tmpfs     5.0M     0  5.0M   0% /run/lock
tmpfs          tmpfs    1000M     0 1000M   0% /sys/fs/cgroup
/dev/vda3      ext4       50G   17G   31G  36% /data
tmpfs          tmpfs     200M     0  200M   0% /run/user/1000

cat /etc/fstab
# /etc/fstab: static file system information.
#
# Use 'blkid' to print the universally unique identifier for a
# device; this may be used with UUID= as a more robust way to name devices
# that works even if disks are added and removed. See fstab(5).
#
# <file system> <mount point>   <type>  <options>       <dump>  <pass>
# / was on /dev/vda1 during installation
UUID=bec2c6ce-a9f5-4ebf-a264-065bcd55f2d4 /               ext4    errors=remount-ro 0       1
# swap was on /dev/vda5 during installation
UUID=8efef618-8831-4075-aae1-1d95730b25e8 none            swap    sw              0       0
UUID=f1304b76-c52f-41c5-9770-f8fadcf2f2d8 /data  ext4  defaults 0 2


 swapon -s
Filename                                Type            Size    Used    Priority
/dev/vda2                               partition       2095100 2094876 -1


sudo blkid
/dev/vda3: UUID="f1304b76-c52f-41c5-9770-f8fadcf2f2d8" TYPE="ext4" PARTLABEL="Linux filesystem" PARTUUID="0b483f43-b168-4a48-bc64-13428db0f42b"
/dev/vda2: UUID="8efef618-8831-4075-aae1-1d95730b25e8" TYPE="swap" PARTLABEL="Linux swap" PARTUUID="707f15c7-5c40-4501-949c-218fd115e7d9"
/dev/vda1: UUID="bec2c6ce-a9f5-4ebf-a264-065bcd55f2d4" TYPE="ext4" PARTLABEL="Linux filesystem" PARTUUID="dae9a827-082d-4aad-9438-f2da8cc6f62c"

ssh cho45@stfuawsc.com -C -t 'sudo dump -0u -f - /dev/vda1' > sakura-dev-vda1.dump
ssh cho45@stfuawsc.com -C -t 'sudo dump -0u -f - /dev/vda3' > sakura-dev-vda3.dump

upgrade後

h2o の再ビルド再インストール (libc の更新による)
perl 関係

DBD::mysql
cpanm install Crypt::OpenSSL::Random

rabitmq-server
mqtt proxy として使ってるが、再インストールして設定しなおした。

HTML5 の svg 要素を canvas に描く方法

tech | 00:26 |

こうする

async function loadAsImage(svg) {
	return new Promise((resolve, reject) => {
		const svgXml = new XMLSerializer().serializeToString(svg);

		const blob = new Blob([svgXml], { type: 'image/svg+xml' });
		const url = URL.createObjectURL(blob);

		const img = new Image();
		img.onload = () => {
			URL.revokeObjectURL(url);
			resolve(img);
		};
		img.onerror = (e) => {
			URL.revokeObjectURL(url);
			reject(e);
		};
		img.src = url;
		console.log(url);
	});
}

const img = await loadAsImage(svg);
ctx.drawImage(img, 0, 0);