Suricata

i install and running suricata well, but there is not any alerts aflter my installing.

suricata-config

```
[root@oracle7 suricata-6.0.2]# /opt/suricata/bin/suricata --build-info
This is Suricata version 6.0.2 RELEASE
Features: PCAP_SET_BUFF AF_PACKET HAVE_PACKET_FANOUT LIBCAP_NG LIBNET1.1 HAVE_HTP_URI_NORMALIZE_HOOK PCRE_JIT HAVE_NSS HAVE_LUA HAVE_LUAJIT HAVE_LIBJANSSON PROFILING TLS TLS_GNU RUST
SIMD support: SSE_4_2 SSE_4_1 SSE_3
Atomic intrinsics: 1 2 4 8 16 byte(s)
64-bits, Little-endian architecture
GCC version 4.8.5 20150623 (Red Hat 4.8.5-44.0.3), C version 199901
compiled with _FORTIFY_SOURCE=0
L1 cache line size (CLS)=64
thread local storage method: __thread
compiled with LibHTP v0.5.37, linked against LibHTP v0.5.37

Suricata Configuration:
AF_PACKET support: yes
eBPF support: no
XDP support: no
PF_RING support: no
NFQueue support: no
NFLOG support: no
IPFW support: no
Netmap support: no
DAG enabled: no
Napatech enabled: no
WinDivert enabled: no

Unix socket enabled:                     yes
  Detection enabled:                       yes

Libmagic support:                        no
  libnss support:                          yes
  libnspr support:                         yes
  libjansson support:                      yes
  hiredis support:                         no
  hiredis async with libevent:             no
  Prelude support:                         no
  PCRE jit:                                yes
  LUA support:                             yes, through luajit
  libluajit:                               yes
  GeoIP2 support:                          no
  Non-bundled htp:                         no
  Hyperscan support:                       yes
  Libnet support:                          yes
  liblz4 support:                          no

Rust support:                            yes
  Rust strict mode:                        no
  Rust compiler path:                      /root/.cargo/bin/rustc
  Rust compiler version:                   rustc 1.52.1 (9bc8c42bb 2021-05-09)
  Cargo path:                              /root/.cargo/bin/cargo
  Cargo version:                           cargo 1.52.0 (69767412a 2021-04-21)
  Cargo vendor:                            yes

Python support:                          yes
  Python path:                             /usr/bin/python3
  Python distutils                         yes
  Python yaml                              yes
  Install suricatactl:                     yes
  Install suricatasc:                      yes
  Install suricata-update:                 yes

Profiling enabled:                       yes
  Profiling locks enabled:                 no

Plugin support (experimental):           yes

Development settings:
Coccinelle / spatch: no
Unit tests enabled: no
Debug output enabled: no
Debug validation enabled: no

Generic build parameters:
Installation prefix: /opt/suricata
Configuration directory: /opt/suricata/etc/suricata/
Log directory: /opt/suricata/var/log/suricata/

--prefix                                 /opt/suricata
  --sysconfdir                             /opt/suricata/etc
  --localstatedir                          /opt/suricata/var
  --datarootdir                            /opt/suricata/share

Host:                                    x86_64-pc-linux-gnu
  Compiler:                                gcc (exec name) / g++ (real)
  GCC Protect enabled:                     no
  GCC march native enabled:                yes
  GCC Profile enabled:                     no
  Position Independent Executable enabled: no
  CFLAGS                                   -g -O2 -std=gnu99 -march=native -I${srcdir}/../rust/gen -I${srcdir}/../rust/dist
  PCAP_CFLAGS                               -I/usr/local/include
  SECCFLAGS

```

i build it in oracle linux 7; what's the wrong with me . the event_type is alert can not produce even if
`curl -A - http://www.xxxx.com` not produce, but in other environment i produced 3 years ago can be well.