今天算是把博客迁移过来了。自从 Kosscloud 发布运营中止公告以来,这个博客如何迁移便是最大的问题了。

期待有一天能与喜欢的idc重逢(?(無断転載
期待有一天能与喜欢的idc重逢(?(無断転載

由于没有经验,加上是从 Ubuntu 迁移到 CentOS,因此过程中遇到了挺多麻烦事。不过好在本身的迁移是相当简单的,因此最后也算是完美迁移成功了。这篇文章也算是记录一下成果吧(

ToC

准备迁移

我们需要准备的内容是 wordpress 目录数据库。目录我们通过 tar 打包:

tar czvf ~/wordpress.tar.gz ./wordpress/*

而数据库,我们则通过 mysqldump 导出:

sudo mysqldump -uroot --databases wp_site > ~/db.sql

就此,第一步就算是完成了。

数据转移

这一步是两台服务器之间的操作,把数据拖到新服务器上就行了。具体怎么拖随你便(

安装与简单配置

caddy

我们依然是以 caddy 作为服务器(因为有上台服务器的现成配置可以抄)。首先是安装:

curl https://getcaddy.com | bash -s personal http.webdav,tls.dns.cloudflare,http.filter,http.cors,tls.dns.godaddy

然后是用户,我们给 caddy 单独分配一个用户和用户组:

sudo useradd -s /sbin/nologin -M caddy

sudo groupmems -a caddy -g caddy

然后,我们配置 service

sudo vim /etc/systemd/system/caddy.service

写入如下内容:

[Unit]

Description=Caddy HTTP/2 web server

Documentation=https://caddyserver.com/docs

After=network-online.target

Wants=network-online.target systemd-networkd-wait-online.service

; Do not allow the process to be restarted in a tight loop. If the

; process fails to start, something critical needs to be fixed.

StartLimitIntervalSec=14400

StartLimitBurst=20

[Service]

Restart=on-abnormal

; User and group the process will run as.

User=caddy

Group=caddy

; Letsencrypt-issued certificates will be written to this directory.

Environment=CADDYPATH=/etc/ssl/caddy

Environment=CLOUDFLARE_EMAIL=xxx

Environment=CLOUDFLARE_API_KEY=xxx

Environment=GODADDY_API_KEY=xxx

Environment=GODADDY_API_SECRET=xxx

; Always set "-root" to something safe in case it gets forgotten in the Caddyfile.

ExecStart=/usr/local/bin/caddy -log stdout -log-timestamps=false -agree=true -conf=/etc/caddy/Caddyfile -root=/var/tmp

ExecReload=/bin/kill -USR1 $MAINPID

; Use graceful shutdown with a reasonable timeout

KillMode=mixed

KillSignal=SIGQUIT

TimeoutStopSec=5s

; Limit the number of file descriptors; see `man systemd.exec` for more limit settings.

LimitNOFILE=1048576

; Unmodified caddy is not expected to use more than that.

LimitNPROC=512

; Use private /tmp and /var/tmp, which are discarded after caddy stops.

PrivateTmp=true

; Use a minimal /dev (May bring additional security if switched to 'true', but it may not work on Raspberry Pi's or other devices, so it has been disabled in this dist.)

PrivateDevices=false

; Hide /home, /root, and /run/user. Nobody will steal your SSH-keys.

ProtectHome=false

; Make /usr, /boot, /etc and possibly some more folders read-only.

ProtectSystem=full

; … except /etc/ssl/caddy, because we want Letsencrypt-certificates there.

; This merely retains r/w access rights, it does not add any new. Must still be writable on the host!

ReadWritePaths=/etc/ssl/caddy

ReadWriteDirectories=/etc/ssl/caddy

; The following additional security directives only work with systemd v229 or later.

; They further restrict privileges that can be gained by caddy. Uncomment if you like.

; Note that you may have to add capabilities required by any plugins in use.

;CapabilityBoundingSet=CAP_NET_BIND_SERVICE

;AmbientCapabilities=CAP_NET_BIND_SERVICE

;NoNewPrivileges=true

[Install]

WantedBy=multi-user.target

最后启动:

sudo systemctl start caddy

sudo systemctl enable caddy

在启动过程中可能遇到如下的问题:

226/NAMESPACE

需要自行新建 /etc/ssl/caddy 目录,并将其 chowncaddy 用户。

203/EXEC

可能是 SELinux 原因。

php

新系统中我们想要安装 php-7.4,但 CentOS 8 默认只给到 php-7.2(怎么和 1804 一样),因此我们需要自己动手(

sudo dnf -y install dnf-utils

sudo yum -y install https://dl.fedoraproject.org/pub/epel/epel-release-latest-8.noarch.rpm

sudo yum -y install https://rpms.remirepo.net/enterprise/remi-release-8.rpm

sudo dnf module install php:remi-7.4

至此,php 算是装好了,但配置还不大行。我们需要让 caddy 用户组的成员能够使用 php-fpm,因此我们需要去修改 php-fpm

sudo vim /etc/php-fpm.d/www.conf

找到 listen.acl_users,它应该是长这个样子的:

listen.acl_users = apache,nginx

在后面加上 caddy 就可以了:

listen.acl_users = apache,nginx,caddy

最后启动:

sudo systemctl start php-fpm.service

sudo systemctl enable php-fpm.service

mariadb

首先是正常安装 mariadb

sudo dnf install mariadb-server

然后,我们需要配置数据库用户。这里需要注意的是,我们需要和被迁移站的设置完全一致

sudo mysql

然后输入以下内容(需要修改):

CREATE DATABASE 数据库名;

CREATE USER 用户名@localhost;

SET PASSWORD FOR inorin@localhost= PASSWORD("密码");

GRANT ALL PRIVILEGES ON 数据库名.* TO 用户名@localhost IDENTIFIED BY '密码';

FLUSH PRIVILEGES;

exit

就此,mariadb 的配置就完成了。

数据恢复

站点数据

首先是站点数据,我们将 wordpress.tar.gz 解压:

tar -zxvf ./wordpress.tar.gz ./wordpress/

记住这个路径,之后会用到。

数据库

导入数据只要通过 source 就可以了:

sudo mysql

# 在 mysql 中

source db.sql

站点上线

Caddy

首先是要配置 Caddy。我们写入 Caddyfile:

# Blog

https://blog.mmf.moe {

tls {

dns godaddy

}

gzip

root /var/www/wordpress

fastcgi / /run/php-fpm/www.sock php

rewrite {

if {path} not_match ^\/wp-admin|log

to {path} {path}/ /index.php?{query}

}

}

然后重载 caddy

sudo systemctl reload caddy

修改解析

我们需要修改解析为迁移后的 IP。不过我这里是用的 Cloudflare CNAME 接入(见之前文章),因此我只需要修改 CF 方面的 IP 就行了,对外的 DNS 解析是不变的。

配置防火墙

众所周知,CentOS 使用的是 firewalld,我们也需要这样一个防火墙来保护服务器的安全。配置的步骤很简单,如下所示:

sudo systemctl start firewalld # 开启防火墙

sudo systemctl enable firewalld # 开机自启防火墙

sudo firewall-cmd --set-default-zone=drop # 默认全部 drop

sudo firewall-cmd --add-service=http --permanent # 放行 http

sudo firewall-cmd --add-service=https --permanent # 放行 https

sudo firewall-cmd --add-service=ssh --permanent # 放行 ssh

sudo firewall-cmd --reload # 重载以应用配置

至此,全站迁移完成。