Raspberry Pi crontab not work bug All In One
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Raspberry Pi crontab 不执行 bug
bug ❌
# 用户 crontab (pi)
pi@raspberrypi:~/Desktop $ crontab -e
pi@raspberrypi:~/Desktop $ crontab -l
# 用户 crontab (root)
pi@raspberrypi:~/Desktop $ sudo crontab -e
pi@raspberrypi:~/Desktop $ sudo crontab -l
# Edit this file to introduce tasks to be run by cron.
#
# Each task to run has to be defined through a single line
# indicating with different fields when the task will be run
# and what command to run for the task
#
# To define the time you can provide concrete values for
# minute (m), hour (h), day of month (dom), month (mon),
# and day of week (dow) or use '*' in these fields (for 'any').
#
# Notice that tasks will be started based on the cron's system
# daemon's notion of time and timezones.
#
# Output of the crontab jobs (including errors) is sent through
# email to the user the crontab file belongs to (unless redirected).
#
# For example, you can run a backup of all your user accounts
# at 5 a.m every week with:
# 0 5 * * 1 tar -zcf /var/backups/home.tgz /home/
#
# For more information see the manual pages of crontab(5) and cron(8)
#
# m h dom mon dow command
- 用户
crontab(⚠️ 没有用户字段 pi )
# 自动化执行脚本 ✅
# 每隔 3 分钟执行一次
# 分钟 小时 天 月 周
#3 * * * * pi sh ./Desktop/gpio.py
# user python 参数
# 3 * * * * pi python ./gpio.py 3
# 绝对路径 python ✅
# 二合一输出 log 🚀
3 * * * * /usr/bin/python /home/pi/Desktop/gpio.py 3 > /home/pi/Desktop/gpio.log.txt 2>&1
# 用户 crontab(⚠️ 没有用户字段 pi )
# 3 * * * * pi /usr/bin/python /home/pi/Desktop/gpio.py 3
- 系统 crontab
/etc/crontab
# /etc/crontab 系统 crontab ✅
# user python 参数
# 3 * * * * pi python ./gpio.py 3
# 绝对路径 python ✅
# 二合一输出 log 🚀
3 * * * * pi /usr/bin/python /home/pi/Desktop/gpio.py 3 > /home/pi/Desktop/gpio.log.txt 2>&1
问题分析
# 开启 cron log ✅
$ sudo vim /etc/rsyslog.conf
# cron.* /var/log/cron.log
# 重启 rsyslog 服务
$ sudo /etc/init.d/rsyslog restart
Restarting rsyslog (via systemctl): rsyslog.service.
# 查看日志信息
$ cat /var/log/cron.log
# (CRON) info (No MTA installed, discarding output) ❌ 没有配置邮件服务器
安装&配置邮件服务器 email / mail
# ✅ step 1
$ sudo apt-get install postfix
# 选 Local Only
$ sudo apt-get install postfix
正在读取软件包列表... 完成
正在分析软件包的依赖关系树... 完成
正在读取状态信息... 完成
下列软件包是自动安装的并且现在不需要了：
libfuse2
使用'sudo apt autoremove'来卸载它(它们)。
建议安装：
procmail postfix-mysql postfix-pgsql postfix-ldap postfix-pcre postfix-lmdb postfix-sqlite sasl2-bin
| dovecot-common postfix-cdb mail-reader ufw postfix-doc
下列【新】软件包将被安装：
postfix
升级了 0 个软件包，新安装了 1 个软件包，要卸载 0 个软件包，有 41 个软件包未被升级。
需要下载 1,503 kB 的归档。
解压缩后会消耗 4,146 kB 的额外空间。
获取:1 http://deb.debian.org/debian bullseye/main arm64 postfix arm64 3.5.17-0+deb11u1 [1,503 kB]
已下载 1,503 kB，耗时 51秒 (29.3 kB/s)
正在预设定软件包 ...
正在选中未选择的软件包 postfix。
(正在读取数据库 ... 系统当前共安装有 99543 个文件和目录。)
准备解压 .../postfix_3.5.17-0+deb11u1_arm64.deb ...
正在解压 postfix (3.5.17-0+deb11u1) ...
正在设置 postfix (3.5.17-0+deb11u1) ...
正在添加组"postfix" (GID 124)...
完成。
正在添加系统用户"postfix" (UID 116)...
正在将新用户"postfix" (UID 116)添加到组"postfix"...
无法创建主目录"/var/spool/postfix"。
Creating /etc/postfix/dynamicmaps.cf
正在添加组"postdrop" (GID 125)...
完成。
setting myhostname: raspberrypi.lan
setting alias maps
setting alias database
mailname is not a fully qualified domain name. Not changing /etc/mailname.
setting destinations: $myhostname, raspberrypi, localhost.localdomain, localhost
setting relayhost:
setting mynetworks: 127.0.0.0/8 [::ffff:127.0.0.0]/104 [::1]/128
setting mailbox_size_limit: 0
setting recipient_delimiter: +
setting inet_interfaces: loopback-only
setting default_transport: error
setting relay_transport: error
setting inet_protocols: all
/etc/aliases does not exist, creating it.
WARNING: /etc/aliases exists, but does not have a root alias.
Postfix (main.cf) is now set up with a default configuration. If you need to
make changes, edit /etc/postfix/main.cf (and others) as needed. To view
Postfix configuration values, see postconf(1).
After modifying main.cf, be sure to run 'systemctl reload postfix'.
Running newaliases
Created symlink /etc/systemd/system/multi-user.target.wants/postfix.service → /lib/systemd/system/postfix.service.
正在处理用于 man-db (2.9.4-2) 的触发器 ...
正在处理用于 rsyslog (8.2102.0-2+deb11u1) 的触发器 ...
Postfix Configuration ├───────────────────────────┐
│ Please select the mail server configuration type that best meets your needs. │
│ │
│ No configuration: │
│ Should be chosen to leave the current configuration unchanged. │
│ Internet site: │
│ Mail is sent and received directly using SMTP. │
│ Internet with smarthost: │
│ Mail is received directly using SMTP or by running a utility such │
│ as fetchmail. Outgoing mail is sent using a smarthost. │
│ Satellite system: │
│ All mail is sent to another machine, called a 'smarthost', for delivery. │
│ Local only: │
│ The only delivered mail is the mail for local users. There is no network. │
│ │
│ General type of mail configuration: │
│ │
│ No configuration │
│ Internet Site │
│ Internet with smarthost │
│ Satellite system │
│ Local only │
│ │
│ │
│ <确定> <取消>
Postfix Configuration ├────────────────────────────────────────────┐
│ The "mail name" is the domain name used to "qualify" _ALL_ mail addresses without a domain name. This includes │
│ mail to and from <root>: please do not make your machine send out mail from root@example.org unless │
│ root@example.org has told you to. │
│ │
│ This name will also be used by other programs. It should be the single, fully qualified domain name (FQDN). │
│ │
│ Thus, if a mail address on the local host is foo@example.org, the correct value for this option would be │
│ example.org. │
│ │
│ System mail name: │
│ │
│ raspberrypi____________________________________________________________________________________________________ │
│ │
│ <确定> <取消>
# ✅ step 2
$ sudo dpkg-reconfigure postfix
# 选 Local Only
sudo dpkg-reconfigure postfix
setting synchronous mail queue updates: true
mailname is not a fully qualified domain name. Not changing /etc/mailname.
setting destinations: raspberrypi.lan, raspberrypi, localhost.localdomain, localhost
setting relayhost:
setting mynetworks: 127.0.0.0/8 [::ffff:127.0.0.0]/104 [::1]/128
setting mailbox_size_limit: 0
setting recipient_delimiter: +
setting inet_interfaces: loopback-only
setting inet_protocols: all
WARNING: /etc/aliases exists, but does not have a root alias.
Postfix (main.cf) is now set up with the changes above. If you need to make
changes, edit /etc/postfix/main.cf (and others) as needed. To view Postfix
configuration values, see postconf(1).
After modifying main.cf, be sure to run 'systemctl reload postfix'.
Running newaliases
Postfix Configuration ├────────────────────────────────────────────┐
│ Mail for the 'postmaster', 'root', and other system accounts needs to be redirected to the user account of the │
│ actual system administrator. │
│ │
│ If this value is left empty, such mail will be saved in /var/mail/nobody, which is not recommended. │
│ │
│ Mail is not delivered to external delivery agents as root. │
│ │
│ If you already have a /etc/aliases file and it does not have an entry for root, then you should add this │
│ entry. Leave this blank to not add one. │
│ │
│ Root and postmaster mail recipient: │
│ │
│ _______________________________________________________________________________________________________________ │
│ │
│ <确定> <取消> │
│
Postfix Configuration ├────────────────────────────────────────┐
│ Please give a comma-separated list of domains for which this machine should consider itself the final │
│ destination. If this is a mail domain gateway, you probably want to include the top-level domain. │
│ │
│ Other destinations to accept mail for (blank for none): │
│ │
│ raspberrypi.lan, raspberrypi, localhost.localdomain, localhost_________________________________________ │
│ │
│ <确定> <取消> │
│
Postfix Configuration ├────────────────────────────────────────────┐
│ │
│ If synchronous updates are forced, then mail is processed more slowly. If not forced, then there is a remote │
│ chance of losing some mail if the system crashes at an inopportune time, and you are not using a journaled │
│ filesystem (such as ext3). │
│ │
│ Force synchronous updates on mail queue? │
│ │
│ <是> <否> │
│
# 重启计划任务
$ sudo /etc/init.d/cron restart
# 查看邮件
$ cat /var/mail/root
# cat: /var/mail/root: 没有那个文件或目录
$ cat /var/mail/pi
# cat: /var/mail/pi: 没有那个文件或目录
开启 cron log
$ cat /etc/rsyslog.conf
# /etc/rsyslog.conf configuration file for rsyslog
#
# For more information install rsyslog-doc and see
# /usr/share/doc/rsyslog-doc/html/configuration/index.html
#################
#### MODULES ####
#################
module(load="imuxsock") # provides support for local system logging
module(load="imklog") # provides kernel logging support
#module(load="immark") # provides --MARK-- message capability
# provides UDP syslog reception
#module(load="imudp")
#input(type="imudp" port="514")
# provides TCP syslog reception
#module(load="imtcp")
#input(type="imtcp" port="514")
###########################
#### GLOBAL DIRECTIVES ####
###########################
#
# Use traditional timestamp format.
# To enable high precision timestamps, comment out the following line.
#
$ActionFileDefaultTemplate RSYSLOG_TraditionalFileFormat
#
# Set the default permissions for all log files.
#
$FileOwner root
$FileGroup adm
$FileCreateMode 0640
$DirCreateMode 0755
$Umask 0022
#
# Where to place spool and state files
#
$WorkDirectory /var/spool/rsyslog
#
# Include all config files in /etc/rsyslog.d/
#
$IncludeConfig /etc/rsyslog.d/*.conf
###############
#### RULES ####
###############
#
# First some standard log files. Log by facility.
#
auth,authpriv.* /var/log/auth.log
*.*;auth,authpriv.none -/var/log/syslog
#cron.* /var/log/cron.log
# 开启 cron log ✅
cron.* /var/log/cron.log
daemon.* -/var/log/daemon.log
kern.* -/var/log/kern.log
lpr.* -/var/log/lpr.log
mail.* -/var/log/mail.log
user.* -/var/log/user.log
#
# Logging for the mail system. Split it up so that
# it is easy to write scripts to parse these files.
#
mail.info -/var/log/mail.info
mail.warn -/var/log/mail.warn
mail.err /var/log/mail.err
#
# Some "catch-all" log files.
#
*.=debug;\
auth,authpriv.none;\
mail.none -/var/log/debug
*.=info;*.=notice;*.=warn;\
auth,authpriv.none;\
cron,daemon.none;\
mail.none -/var/log/messages
#
# Emergencies are sent to everybody logged in.
#
*.emerg :omusrmsg:*
refs
https://www.cnblogs.com/xgqfrms/p/15384401.html#5166823
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