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--- raspberry-pi [2017/02/05 13:31]
dblume [Backing-up And Restoring the SD Card]
+++ raspberry-pi [2018/01/07 22:33] (current)
dblume [Logs]
@@ Line 67: / Line 67: @@
 When there are problems, check for logs in ''/var/log/syslog'' or ''/var/log/messages''.
+I think we need to update ''/etc/systemd/system/log2ram.service'' to make log2ram come after nginx, like so...
+<file bash log2ram.service>
+[Unit]
+Description=Log2Ram
+DefaultDependencies=no
+Before=basic.target rsyslog.service syslog.target systemd-journald.service sysinit.target shutdown.target apache2.service nginx.service
+After=local-fs.target
+Conflicts=shutdown.target reboot.target halt.target
+RequiresMountsFor=/var/log /var/hdd.log
+IgnoreOnIsolate=yes
+[Service]
+Type=oneshot
+ExecStart= /usr/local/bin/log2ram start
+ExecStop= /usr/local/bin/log2ram stop
+ExecReload= /usr/local/bin/log2ram write
+RemainAfterExit=yes
+[Install]
+WantedBy=sysinit.target
+</file>
+Otherwise, it turns out that log2ram does screw up nginx's ability to start on power-cycle. Maybe need something like the following...
+<file bash todo_after_powercycle.sh>
+#!/usr/bin/env bash
+# The tool we use to save flash affects the startup of nginx
+if [ ! -d "/var/log/nginx" ]; then
+  sudo mkdir /var/log/nginx
+fi
+# if service --status-all | grep -Fq '[ - ]  nginx'; then
+if ! service nginx status | grep -Fq 'active (running)'; then
+  sudo /etc/init.d/nginx start > /dev/null
+  # systemctl start nginx
+fi
+</file>
 ===== Keyboard Repeat Problem =====
@@ Line 145: / Line 184: @@
 You should find that /etc/letsencrypt/live is populated with files like pi.dlma.com/cert1
-. Renew with
+. Renew (and reload if successful) with
-  certbot renew
+  sudo certbot renew && /usr/sbin/service nginx reload
+. Consider using a root cronjob
+   sudo crontab -e
+5 * * 0 certbot renew --post-hook "service nginx reload" >> /var/log/letsencrypt-renew.log
 <code>
@@ Line 153: / Line 197: @@
  - Congratulations! Your certificate and chain have been saved at
    /etc/letsencrypt/live/pi.dlma.com/fullchain.pem. Your cert will
-   expire on 2017-01-31. To obtain a new or tweaked version of this
+   expire on 2017-09-31. To obtain a new or tweaked version of this
    certificate in the future, simply run certbot again. To
    non-interactively renew *all* of your certificates, run "certbot
@@ Line 186: / Line 230: @@
           listen [::]:80 default_server;
           server_name pi.dlma.com;
-          return 302 https://$server_name$request_uri;
+          return 301 https://$server_name$request_uri;
   }
@@ Line 208: / Line 252: @@
 **TODO**: Renew with ''certbot renew --quiet'' as per [[https://certbot.eff.org/#debianjessie-nginx|certbot]] or [[https://bjornjohansen.no/letsencrypt-nginx|manually]].
+===== PiHole =====
+**Note**: I've currently got an incompatibility between PiHole and HTTPS redirecting. So I'm not using CertBot at the moment. Will have to figure that out.
+PiHole connects to FTL over port 4711.  If FTL were running, it'd have a logfile you could view like so:
+<code bash>
+$ cat /var/log/pihole-FTL.log
+</code>
+You could also do the following:
+<code bash>
+telnet 127.0.0.1 4711
+>stats
+</code>
+or
+<code bash>
+echo ">stats" | nc 127.0.0.1 4711
+</code>
+If you can't connect, you can see which services are listening like so:
+<code bash>
+$ sudo netstat -tulpn
+$ sudo netstat -tulpn | grep FTL
+</code>
+I eventually clued in to my problem here:
+<code bash>
+$ pihole-FTL running
+FATAL: Opening of FTL log (/var/log/pihole-FTL.log) failed!
+       Make sure it exists and is writeable by user pi
+raspberrypi:~$ ls -l /var/log/pihole*
+-rw-r--r-- 1 pihole  pihole        0 Nov 24 20:42 /var/log/pihole-FTL.log
+-rw-r--r-- 1 pihole  pihole      312 Sep  4 00:00 /var/log/pihole-FTL.log.1
+-rw-r----- 1 dnsmasq root   18538496 Nov 24 12:46 /var/log/pihole.log
+-rw-r----- 1 dnsmasq root   15273984 Sep 12 00:00 /var/log/pihole.log.1
+...
+raspberrypi:~$ cat /var/log/pihole-FTL.log.1
+[2017-09-03 15:17:05.038] FATAL: Opening of /var/log/pihole.log failed!
+[2017-09-03 15:17:05.038]        Make sure it exists and is readable by user pihole
+$ sudo chmod +r /var/log/pihole.log
+$ sudo service pihole-FTL restart
+$ sudo netstat -tulpn | grep FTL
+tcp        0      0 127.0.0.1:4711          0.0.0.0:*               LISTEN      11082/pihole-FTL
+</code>
+And eventually discovered that my actual problem was that my log2ram mount was full. After fixing /var/log, I still had to ask pihole to restart its DNS.
+<code>
+$ pihole restartdns
+</code>
+==== Example PiHole API ====
+<code>
+curl "http://pi.hole/admin/api.php?summary" | python -m json.tool
+</code>
+Keywords: Lets Encrypt, LetsEncrypt, Hole