Brace missing or sth like that?
In the log you showed that error went away after a reboot or so that’s why i didn’t chase it.
This is the error i was referring to.
It also says what the issue is: server.use-ipv6
As you don’t need that config option, find it and remove it.
Already changed line
server.use-ipv6 = "enable"
to
server.use-ipv6 = "disable"
and rebooted, but “AJAX call failed, unable to fetch data” persists.
did you check via wget?
As it gives you an http error code that’s much more useful.
Also at least temporary (doesn’t survive dump1090-fa restart) try this:
sudo chmod 777 /run/dump1090-fa
Already done it, no use.
.
Will try tonight, away from PC now.
make failed without librtlsdr even though I have installed rtl-sdr
make succeded only after librtlsdr was installed.
rtl-sdr installed, but without installing librtlsdr[abcd@localhost dump1090-fa]$ sudo dnf install rtl-sdr
[abcd@localhost dump1090-fa]$ sudo make BLADERF=no
.... .... ....
Package 'librtlsdr', required by 'virtual:world', not found
cc -DMODES_DUMP1090_VERSION=\"\" -DMODES_DUMP1090_VARIANT=\"dump1090-fa\" -DENABLE_RTLSDR -std=c11 -O2 -g -Wall -Werror -W -D_DEFAULT_SOURCE -c ais_charset.c -o ais_charset.o
Package librtlsdr was not found in the pkg-config search path.
Perhaps you should add the directory containing `librtlsdr.pc'
to the PKG_CONFIG_PATH environment variable
Package 'librtlsdr', required by 'virtual:world', not found
cc -DMODES_DUMP1090_VERSION=\"\" -DMODES_DUMP1090_VARIANT=\"dump1090-fa\" -DENABLE_RTLSDR -std=c11 -O2 -g -Wall -Werror -W -D_DEFAULT_SOURCE -c sdr_rtlsdr.c -o sdr_rtlsdr.o
sdr_rtlsdr.c:54:10: fatal error: rtl-sdr.h: No such file or directory
54 | #include <rtl-sdr.h>
| ^~~~~~~~~~~
compilation terminated.
make: *** [Makefile:45: sdr_rtlsdr.o] Error 1
.
rtl-sdrlibrtlsdr installed and rtl-sdr removed[abcd@localhost dump1090-fa]$ sudo dnf remove rtl-sdr
[abcd@localhost dump1090-fa]$ ./dump1090
./dump1090: error while loading shared libraries: librtlsdr.so.0: cannot open shared object file: No such file or directory
.
rtl-sdr installed[abcd@localhost dump1090-fa]$ sudo dnf install rtl-sdr
[abcd@localhost dump1090-fa]$ ./dump1090
Wed Jan 22 13:24:29 2020 EST dump1090-fa starting up.
rtlsdr: using device #0: Generic RTL2832U (Realtek, RTL2832UFA, SN 00000101)
Detached kernel driver
Found Rafael Micro R820T tuner
rtlsdr: tuner gain set to 49.6 dB
Allocating 4 zero-copy buffers
*5dc01aa771a3b9;
CRC: 000000
RSSI: -1.8 dBFS
Score: 750
Time: 8929001.67us
DF:11 AA:C01AA7 IID:0 CA:5
All Call Reply (reliable)
ICAO Address: C01AA7 (Mode S / ADS-B)
Air/Ground: airborne
I don’t think you understand the packaging here. The compile failure will be because you’re missing a development/headers package somewhere.
My point was that it makes no sense to mix the distribution-provided packages with a compiled-from-source library, and doing so is asking for random crashes in anything that uses the library if there have been any ABI changes. If you’re going to build from source and install system-wide, then don’t install the distribution-provided packages, and you should probably rebuild everything that uses librtlsdr from source too.
Thanks Oliver for guidance.
After some “research” 
& Googling, I found that make install installs librtlsdr.so.xx file in directory /usr/lib/. This does not match Fedora/RHEL, which requires the x64 library files to be located in /usr/lib64. As a result installing x64 package rtl-sdr from Fedora repository became necessary.
Added following flags to cmake ../ command:
-DLIB_INSTALL_DIR=/usr/lib64 -DCMAKE_INSTALL_PREFIX=/usr
Added command sudo ldconfig
(ldconfig command alone did not solve the problem untill I first rebuilt and reinstalled using above noted flags with cmake).
By doing above two things, I no longer needed following two commands:
sudo dnf install rtl-sdr
sudo cp /usr/local/lib/pkgconfig/librtlsdr.pc /usr/share/pkgconfig/librtlsdr.pc
.
ADDITIONAL IMPROVEMENT:
I also added these two flags to cmake ../:
-DINSTALL_UDEV_RULES=ON -DDETACH_KERNEL_DRIVER=ON
This eliminated blacklisting of rtl modules. Following two steps are no longer required:
sudo nano /etc/modprobe.d/blacklist-rtl-sdr.conf
#Copy-paste following:
blacklist rtl2832
nblacklist dvb_usb_rtl28xxu
blacklist rtl8192cu
blacklist rtl8xxxu
.
sudo wget -O /etc/udev/rules.d/rtl-sdr.rules "https://raw.githubusercontent.com/osmocom/rtl-sdr/master/rtl-sdr.rules"
sudo dnf install libusb-devel
sudo dnf install ncurses-devel
sudo dnf install make
sudo dnf install cmake
git clone https://github.com/steve-m/librtlsdr.git
cd librtlsdr
sudo mkdir build && cd build
sudo cmake ../ -DINSTALL_UDEV_RULES=ON -DDETACH_KERNEL_DRIVER=ON -DLIB_INSTALL_DIR=/usr/lib64 -DCMAKE_INSTALL_PREFIX=/usr
sudo make
sudo make install
sudo ldconfig
sudo git clone https://github.com/flightaware/dump1090.git dump1090-fa
cd dump1090-fa
sudo make BLADERF=no
sudo cp ~/dump1090-fa/dump1090 /usr/bin/dump1090-fa
sudo cp ~/dump1090-fa/debian/dump1090-fa.default /etc/default/dump1090-fa
sudo cp ~/dump1090-fa/debian/dump1090-fa.service /usr/lib/systemd/system/dump1090-fa.service
sudo mkdir -p /usr/share/dump1090-fa/
sudo cp ~/dump1090-fa/debian/start-dump1090-fa /usr/share/dump1090-fa/start-dump1090-fa
sudo cp -r ~/dump1090-fa/public_html /usr/share/dump1090-fa/html
sudo useradd --system dump1090
sudo systemctl enable dump1090-fa
sudo systemctl restart dump1090-fa
Thanks @wiedehopf. Disabling SELinux solved the problem:
sudo nano /etc/sysconfig/selinux
Changed
SELINUX=enforcing
to
SELINUX=disabled
Rebooted Fedora
[abcd@localhost ~]$ wget http://localhost/dump1090-fa/data/aircraft.json
--2020-01-25 01:01:27-- http://localhost/dump1090-fa/data/aircraft.json
Resolving localhost (localhost)... ::1, 127.0.0.1
Connecting to localhost (localhost)|::1|:80... failed: Connection refused.
Connecting to localhost (localhost)|127.0.0.1|:80... connected.
HTTP request sent, awaiting response... 200 OK
Length: 489 [application/json]
Saving to: ‘aircraft.json’
aircraft.json 100%[===================>] 489 --.-KB/s in 0s
2020-01-25 01:01:27 (2.08 MB/s) - ‘aircraft.json’ saved [489/489]
IP-of-Fedora/dump1090-fa/ - failed (timed out)
[abcd@localhost ~]$ sudo firewall-cmd --list-all --zone=public
public
target: default
icmp-block-inversion: no
interfaces:
sources:
services: dhcpv6-client mdns ssh
ports: 80/tcp 443/tcp
protocols:
masquerade: no
forward-ports:
source-ports:
icmp-blocks:
rich rules:
[abcd@localhost ~]$ sudo netstat -ntulp
Active Internet connections (only servers)
Proto Recv-Q Send-Q Local Address Foreign Address State PID/Program name
tcp 0 0 0.0.0.0:8080 0.0.0.0:* LISTEN 763/lighttpd
tcp 0 0 0.0.0.0:80 0.0.0.0:* LISTEN 763/lighttpd
tcp 0 0 0.0.0.0:30002 0.0.0.0:* LISTEN 1349/dump1090-fa
tcp 0 0 0.0.0.0:30003 0.0.0.0:* LISTEN 1349/dump1090-fa
tcp 0 0 0.0.0.0:30004 0.0.0.0:* LISTEN 1349/dump1090-fa
tcp 0 0 0.0.0.0:30005 0.0.0.0:* LISTEN 1349/dump1090-fa
tcp 0 0 0.0.0.0:22 0.0.0.0:* LISTEN 764/sshd
tcp 0 0 127.0.0.1:631 0.0.0.0:* LISTEN 762/cupsd
tcp 0 0 0.0.0.0:30104 0.0.0.0:* LISTEN 1349/dump1090-fa
tcp6 0 0 :::30002 :::* LISTEN 1349/dump1090-fa
tcp6 0 0 :::30003 :::* LISTEN 1349/dump1090-fa
tcp6 0 0 :::30004 :::* LISTEN 1349/dump1090-fa
tcp6 0 0 :::30005 :::* LISTEN 1349/dump1090-fa
tcp6 0 0 :::22 :::* LISTEN 764/sshd
tcp6 0 0 ::1:631 :::* LISTEN 762/cupsd
tcp6 0 0 :::30104 :::* LISTEN 1349/dump1090-fa
udp 0 0 0.0.0.0:38989 0.0.0.0:* 653/avahi-daemon: r
udp 0 0 127.0.0.1:323 0.0.0.0:* 699/chronyd
udp 0 0 0.0.0.0:5353 0.0.0.0:* 653/avahi-daemon: r
udp6 0 0 :::40387 :::* 653/avahi-daemon: r
udp6 0 0 ::1:323 :::* 699/chronyd
udp6 0 0 fe80::244e:7461:3be:546 :::* 737/NetworkManager
udp6 0 0 :::5353 :::* 653/avahi-daemon: r
.
IP-of-Fedora:8080 - Success map showsAfter Googling, found on this site, that it is NOT necessary to disable SELinux as suggested in https://www.tecmint.com/disable-selinux-in-centos-rhel-fedora/.
Instead, keep SELINUX=enforcing and issue following command, and it does the trick:
sudo semanage permissive -a httpd_t
Problem still to resolve:
From another computer on same LAN, IP-of-Fedora/dump1090-fa/ does NOT work (time out).
However IP-of-Fedora:8080 works OK
Did not use chmod 777.
Instead solved it like this:
