2022年2月14日，续费阿里云网站和DNS域名，具体情况如下：

• 阿里云ECS主机，￥256.2，延一年至2023-4-4
• 阿里云DNS域名（pkumet.live），￥66，延一年至2023-3-6

yum update on June 21, 2020

yum update

2020年6月21日，应物理学院个人主页大迁徙，我干脆装个dokuwiki，由于之前已装好php，这真是一次简单而愉快的经历！

===================================
Install DokuWiki (as group website)
AN EASY JOB
June 21, 2020
at /var/www/html/group
take a look at readme.xwen there
===================================

具体这个DokuWiki的维护，请参考硬件与网站 之 本网站维护记录

错误的尝试：用yum安装php：

yum install php php-pdo
========================================================================================================================
 Package                       Arch                      Version                          Repository               Size
========================================================================================================================
Installing:
 php                           x86_64                    5.4.16-46.el7                    base                    1.4 M
 php-pdo                       x86_64                    5.4.16-46.el7                    base                     99 k
Installing for dependencies:
 libzip                        x86_64                    0.10.1-8.el7                     base                     48 k
 php-cli                       x86_64                    5.4.16-46.el7                    base                    2.7 M
 php-common                    x86_64                    5.4.16-46.el7                    base                    565 k

Transaction Summary
========================================================================================================================
Install  2 Packages (+3 Dependent packages)

后来发现这个版本事php 5.4，版本太老，不合用，于是不得不卸载之

SINCE THIS DEFAULT VERSION IS PHP5.4, WAY TOO OLD FOR MEDEAWIKI, I HAVE TO REMOVE THEM BY...
yum erase php php-pdo php-cli php-common

正确的实践：参考网页https://www.tecmint.com/install-mediawiki-on-centos-7/，升级yum并安装php7.3，修改MediaWiki的属性，修改php上传/下载文件容量的限制

===============================================================================
Install MediaWiki (Ref: https://www.tecmint.com/install-mediawiki-on-centos-7/)
===============================================================================
yum install http://rpms.remirepo.net/enterprise/remi-release-7.rpm
yum install epel-release
yum install yum-utils
yum-config-manager --enable remi-php73
yum install php php-pdo php-gd php-mbstring php-xml php-intl
systemctl restart httpd

chown -R apache:apache /var/www/html/mediawiki-1.33.0/
chown -R apache:apache /var/www/html/wiki
chmod 755 /var/www/html/mediawiki-1.33.0/
chmod 755 /var/www/html/wiki/
===============================================================================

Edit /etc/php.ini:
upload_max_filesize 100M (original=2M) 其实后来我又进一步改为500M
post_max_size 128M (original=8M) 其实后来我又进一步改为500M

对编辑器 Vim 进行配置

add lines at the end of /etc/vimrc:
########################
"set encoding=utf-8
"set number
set tabstop=2
"set expandtab
set autoindent

set encoding=UTF-8              to ensure Chinese input in vim
set fileencoding=UTF-8
########################

首先从清华tuna下载anaconda安装包，并安装到/opt目录下

wget https://mirrors.tuna.tsinghua.edu.cn/anaconda/archive/Anaconda3-5.3.1-Linux-x86_64.sh
then install Anaconda3-5.3.1-Linux-x86_64.sh at /opt/anaconda3-3.5.1

磁盘容量因为安装anaconda而少了3.2G！！！真够大的！

Before:
Filesystem      Size  Used Avail Use% Mounted on
/dev/vda1        40G  2.8G   35G   8% /

After:
Filesystem      Size  Used Avail Use% Mounted on
/dev/vda1        40G  6.0G   32G  16% /

把‘conda init’代码段从 /root/.bashrc 复制到 /etc/bashrc 以便于所有用户都能正确加载

move 'conda init' code from /root/.bashrc to /etc/bashrc for ALL USERS like:
####################################
# added by Anaconda3 5.3.1 installer
# >>> conda init >>>
# !! Contents within this block are managed by 'conda init' !!
__conda_setup="$(CONDA_REPORT_ERRORS=false '/opt/anaconda3-5.3.1/bin/conda' shell.bash hook 2> /dev/null)"
if [ $? -eq 0 ]; then
    \eval "$__conda_setup"
else
    if [ -f "/opt/anaconda3-5.3.1/etc/profile.d/conda.sh" ]; then
        . "/opt/anaconda3-5.3.1/etc/profile.d/conda.sh"
        CONDA_CHANGEPS1=true conda activate base
    else
        \export PATH="/opt/anaconda3-5.3.1/bin:$PATH"
    fi
fi
unset __conda_setup
# <<< conda init <<<
####################################

最后生成一下conda已安装包的完整list，并删除安装包（以节省磁盘空间）

generate a conda list in /opt/anaconda3-5.3.1/condalist-20190307 by 'conda list'
remove the original installer file to save 638M disk space.

最开始，干净的新系统一共占硬盘 1.8G 的容量。使用yum命令安装如下程序：

yum update
yum upgrade

yum install gcc (already installed, actually do nothing)
yum install gcc-c++ gcc-gfortran

yum install ImageMagick

yum install lftp
yum install mc tree htop
yum install bzip2 (for install anaconda.sh)

yum install w3m
yum install httpd
    vi /etc/httpd/conf/httpd.conf ---> 如果需要，改为 LISTEN 8000，我其实并未改
    vi /etc/httpd/conf.d/userdir.conf ---> comment out "UserDir disabled"; uncomment "UserDir public_html"
    systemctl status  httpd.service
    systemctl start   httpd.service
    systemctl enable  httpd.service
    systemctl restart httpd.service

yum install netcdf nco ncl ncview grads

2019年3月，闻新宇在aliyun上购买了一个为期3年的云主机，然后购买并绑定在了pkumet.live域名上，该云主机2020年4月3日到期。出于安全和稳定的考虑，这台云主机运行CentOS 7（2019年9月已经释放了CentOS 8，未升级）。主机硬件参数如下：

• 1 Processor
• 1G RAM
• 40G Hard drive
• ~100KB/sec Upload/Download