作者：冥王星 "noright0@163.com"
前言
宿舍有个树莓派2B，连接到电视机，安装OSMC系统，USB接口连接移动硬盘一块，平时用来BT下载和看电影、美剧。
OSMC是基于Debian系统的，可以通过apt-get安装软件，软件仓库中有mongodb，而leanote也有相应的用于arm的二进制包，所以把leanote安装到树莓派是可行的。
mongodb 部分
安装mongodb
sudo apt-get install mongodb
安装软件一般我都用aptitude
配置mongodb运行的用户名
OSMC系统使用的是systemd，mongodb服务启动是在这个文件配置的：/etc/systemd/system/multi-user.target.wants/mongodb.service
文件的内容如下：
[Unit]
Description=An object/document-oriented database
Documentation=man:mongod(1)
[Service]
User=mongodb
ExecStart=/usr/bin/mongod --config /etc/mongodb.conf
[Install]
WantedBy=multi-user.target
我们把User=mongodb改为User=osmc，使其用osmc身份运行。（只是为了方便）
运行命令使配置生效。
sudo systemctl daemon-reload
修改mongodb配置文件
从上边的启动配置文件中可以看出，mongodb启动时读取/etc/mongodb.conf作为配置文件，这个文件的内容如下：
# mongodb.conf
# Where to store the data.
dbpath=/data/db
#where to log
logpath=/data/log/mongodb.log
logappend=true
bind_ip = 127.0.0.1
#port = 27017
# Enable journaling, http://www.mongodb.org/display/DOCS/Journaling
journal=true
# Enables periodic logging of CPU utilization and I/O wait
#cpu = true
# Turn on/off security. Off is currently the default
#noauth = true
#auth = true
# Verbose logging output.
#verbose = true
# Inspect all client data for validity on receipt (useful for
# developing drivers)
#objcheck = true
# Enable db quota management
#quota = true
# Set oplogging level where n is
# 0=off (default)
# 1=W
# 2=R
# 3=both
# 7=W+some reads
#oplog = 0
# Diagnostic/debugging option
#nocursors = true
# Ignore query hints
#nohints = true
# Disable the HTTP interface (Defaults to localhost:27018).
#nohttpinterface = true
# Turns off server-side scripting. This will result in greatly limited
# functionality
#noscripting = true
# Turns off table scans. Any query that would do a table scan fails.
#notablescan = true
# Disable data file preallocation.
#noprealloc = true
# Specify .ns file size for new databases.
# nssize = <size>
# Accout token for Mongo monitoring server.
#mms-token = <token>
# Server name for Mongo monitoring server.
#mms-name = <server-name>
# Ping interval for Mongo monitoring server.
#mms-interval = <seconds>
# Replication Options
# in replicated mongo databases, specify here whether this is a slave or master
#slave = true
#source = master.example.com
# Slave only: specify a single database to replicate
#only = master.example.com
# or
#master = true
#source = slave.example.com
# Address of a server to pair with.
#pairwith = <server:port>
# Address of arbiter server.
#arbiter = <server:port>
# Automatically resync if slave data is stale
#autoresync
# Custom size for replication operation log.
#oplogSize = <MB>
# Size limit for in-memory storage of op ids.
#opIdMem = <bytes>
# SSL options
# Enable SSL on normal ports
#sslOnNormalPorts = true
# SSL Key file and password
#sslPEMKeyFile = /etc/ssl/mongodb.pem
#sslPEMKeyPassword = pass
我们只需要修改数据库文件目录和日志文件的文件名。
因为树莓派的系统安装在TF卡上，频繁读写不仅速度慢，而且容易坏卡。而我的树莓派长期连接一个移动硬盘，所有把数据库文件和日志文件放到移动硬盘也就顺理成章了。
# Where to store the data.
dbpath=/media/sea2t/srv/db
#where to log
logpath=/media/sea2t/srv/log/mongodb.log
启动mongodb
# 启动命令
sudo service mongodb start
# 停止命令
sudo service mongodb stop
# 查看状态
sudo service mongodb status
leanote 部分
下载二进制安装包
从官网下载 leanote 的 for arm 的二进制文件。下载地址在这个网站：http://leanote.org/#download
https://sourceforge.net/projects/leanote-bin/files/2.0/leanote-linux-arm-v2.0.bin.tar.gz/download
解压文件
把安装包解压至移动硬盘。
/media/sea2t/srv/leanote
修改 leanote 配置文件
leanote的配置文件在这里：
/media/sea2t/srv/leanote/conf/app.conf
内容是这样的：
#------------------------
# leanote config
#------------------------
http.port=9000
site.url=http://localhost:9000 # or http://x.com:8080, http://www.xx.com:9000
# admin username
adminUsername=admin
# mongdb
db.host=127.0.0.1
db.port=27017
db.dbname=leanote # required
db.username= # if not exists, please leave it blank
db.password= # if not exists, please leave it blank
# or you can set the mongodb url for more complex needs the format is:
# mongodb://myuser:mypass@localhost:40001,otherhost:40001/mydb
# db.url=mongodb://root:root123@localhost:27017/leanote
# db.urlEnv=${MONGODB_URL} # set url from env. eg. mongodb://root:root123@localhost:27017/leanote
# You Must Change It !! About Security!!
app.secret=V85kbQ8qqtju9y2aDM55VWxAH9Qop19kcDVvrD0y
#--------------------------------
# revel config
# for dev
#--------------------------------
app.name=leanote
http.addr=
http.ssl=false
cookie.httponly=false
cookie.prefix=LEANOTE
cookie.domain= # for share cookie with sub-domain
cookie.secure=false
format.date=2006-01-02
format.datetime=2006-01-02 15:04:05 # 必须这样配置
results.chunked=false
log.trace.prefix = "TRACE "
log.info.prefix = "INFO "
log.warn.prefix = "WARN "
log.error.prefix = "ERROR "
# The default language of this application.
i18n.default_language=en-us
module.static=github.com/revel/modules/static
[dev]
mode.dev=true
results.pretty=true
watch=true
module.testrunner = # github.com/revel/modules/testrunner
log.trace.output = stderr
log.info.output = stderr
log.warn.output = stderr
log.error.output = stderr
[prod]
mode.dev=false
results.pretty=false
watch=false
module.testrunner =
log.trace.output = off
log.info.output = off
log.warn.output = %(app.name)s.log
log.error.output = %(app.name)s.log
我们需要修改的部分有：http.port,site.url,app.secret，其他暂时不需要修改。
需要注意的是site.url，这个是你正文中加在图片等附件前边的url部分，如果和你访问网站的url不同，就不能在网站中看到图片等附件。切切！
设置 leanote 的启动服务
我们把 mongodb.service 复制一下，修改为启动 leanote
sudo cp /etc/systemd/system/multi-user.target.wants/mongodb.service /etc/systemd/system/multi-user.target.wants/leanote.service
[Unit]
Description=Leanote, Not Just A Notepad!
[Service]
User=osmc
ExecStart=/media/sea2t/srv/leanote/bin/run.sh
[Install]
WantedBy=multi-user.target
运行命令使配置生效
sudo systemctl daemon-reload
初始化数据库
运行这个命令初始化数据库（请确认数据库已启动）
mongorestore -h localhost -d leanote --directoryperdb /media/sea2t/srv/leanote/mongodb_backup/leanote_install_data/
启动 leanote
# 启动 leanote
sudo service leanote start
# 停止 leanote
sudo service leanote stop
# 查看状态
sudo service leanote status
备份
一个是数据库文件，备份这个目录
/media/sea2t/srv/db
一个是内容图片附件，备份这个目录
/media/sea2t/srv/leanote/files
一个是leanote配置文件
/media/sea2t/srv/leanote/conf/app.conf
存在的问题
由于 /media/sea2t是通过usb接口连接到系统，系统启动后自动挂载的，所以mongodb和leanote启动时/media/sea2t还没挂载上，两个服务会启动失败，需要手动启动一下。
解决办法：写启动脚本，启动前先等待移动硬盘挂载。
/home/osmc/start_mongodb.sh
#!/bin/bash
while [ ! -f "/media/sea2t/srv/db/local.0" ]; do
echo "=> Waiting for sea2t to be mounted"
sleep 5
done
/usr/bin/mongod --config /etc/mongodb.conf
/home/osmc/start_leanote.sh
#!/bin/bash
while [ ! -f "/media/sea2t/srv/leanote/bin/run.sh" ]; do
echo "=> Waiting for sea2t to be mounted"
sleep 5
done
/media/sea2t/srv/leanote/bin/run.sh
/etc/systemd/system/multi-user.target.wants/mongodb.service
[Unit]
Description=An object/document-oriented database
Documentation=man:mongod(1)
[Service]
User=osmc
ExecStart=/home/osmc/start_mongodb.sh
Restart=always
RestartSec=30
[Install]
WantedBy=multi-user.target
/etc/systemd/system/multi-user.target.wants/leanote.service
[Unit]
Description=Leanote, Not Just A Notepad!
[Service]
User=osmc
ExecStart=/home/osmc/start_leanote.sh
Restart=always
RestartSec=30
[Install]
WantedBy=multi-user.target